![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2025\/04\/Antonio-Manesco-283x300.jpeg\")
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The easily accessible experimental signatures of Majorana modes are ambiguous and only probe topology indirectly: for example, quasi-Majorana states mimic most properties of Majoranas. Establishing a correspondence between an experiment and a theoretical model known to be topological resolves this ambiguity. Here we demonstrate that, already theoretically, determining whether a finite system is topological is by itself ambiguous. In particular, we show that the scattering topological invariant –a probe of topology most closely related to transport signatures of Majoranas–has multiple biases in finite systems. For example, we identify that quasi-Majorana states also mimic the scattering invariant of Majorana zero modes in intermediate-sized systems. We expect that the bias due to finite size effects is universal, and advocate that the analysis of topology in finite systems should be accompanied by a comparison with the thermodynamic limit. Our results are directly relevant to the applications of the topological gap protocol.<\/p>\n<\/div>\n
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Recent advances in free-electron laser (FEL) technology have intensified interest in light-matter interactions in the XUV regime. Our group has been at the forefront of theoretical developments in this field and working closely with experimentalists, c.f. [1] and [2]. While previous studies have focused on traditional strong-coupling processes, enforcing energy conservation via the rotating-wave approximation, we explore now a distinct regime that challenges traditional approximations, namely a regime for ultrastrong coupling on ultrafast timescales, which leads to giant counter-rotating oscillations on the attosecond timescale. Additionally, the use of time symmetries in strong-coupling will be introduced to control quantum entanglement in photoionization [3].<\/p>\n
[1] Nandi, S., et al.<\/i>\u00a0Observation of Rabi dynamics with a short-wavelength free-electron laser.\u00a0Nature<\/i>\u00a0608, 488\u2013493 (2022). <\/p>\n <\/p>\n Chirality\u2014the property of an object that cannot be superimposed on its mirror image\u2014is ubiquitous in nature. Like our hands, opposite versions of the same chiral molecule (R and S enantiomers) behave identically unless they interact with another chiral object. Molecular chirality is rapidly becoming essential in nanotechnology [1], e.g. for developing molecular motors and spintronic devices. The unbalance between R and S biomolecules on Earth (amino acids, sugars, DNA, etc.) supports life. This homochirality gives different biological activities to opposite versions of a chiral drug or pesticide, with profound implications for pharmaceuticals and agriculture. Moreover, abnormal enantiomeric ratios of chiral biomarkers have recently been linked to cancer, Alzheimer\u2019s, diabetes, and other diseases [2].<\/p>\n Having efficient tools for rapid chiral discrimination is therefore vital. However, current optical methods are inefficient because they rely on the (chiral) helix that circularly polarised light draws in space<\/em>. The pitch of this helix\u2014determined by light\u2019s wavelength\u2014is ~10,000 times larger than the molecules. Consequently, the molecules perceive the helix as a flat circle, hardly feeling its chirality. This results in weak chiral sensitivity, typically <0.1%, which presents major limitations [3]. We can overcome these limitations by creating synthetic chiral light [4-6], where the tip of the electric-field vector traces a 3D chiral trajectory in time<\/em>. This new type of chiral light can drive ultrafast chiral currents inside the molecules, which interact with the chiral molecular skeleton in a highly enantiosensitive manner, leading to 100% chiral sensitivity.<\/p>\n In this presentation, I will show how we can shape light\u2019s polarisation in 3D to achieve highly efficient chiral sensing [4-10] and manipulation [11], together with theoretical and computational results that support the feasibility of our approaches. Current optical instrumentation enables several strategies for 3D shaping, such as using several laser beams that propagate non-collinearly [4-6,11], only one beam but tightly focused [7,8], vortex beams to create topological chiral light [9], or ultrafast TACOS [10]. I will discuss how we can bring these ideas to free-electron lasers (FEL), taking advantage of important developments in FEL science and technology that enable the generation of phase-locked two-colour radiation.<\/p>\n [1] J. Brandt et al, Nature Reviews Chemistry 1, 0045 (2017) <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n Quantum reservoir computing (QRC) has emerged as a powerful paradigm for tackling machine-learning tasks by using the rich dynamics of quantum systems. At its core, QRC relies on effective control drives to encode input data and nonlinear mappings to transform these inputs into output features. Photonic platforms are likely candidates for QRC. However, they often lack sufficient nonlinearity for optimal performance. To overcome this limitation, a hybrid optoelectronic approach can be used, combining the speed of optical processing with the inherent nonlinearity of electronics. In this seminar, we present a method to enhance nonlinearity by employing wavefunction engineering within the regime of light-matter coupling. We explore various structures, including GaAs and TMD materials in cavities and waveguides. Through some examples, we demonstrate improvements in the accuracy of some quantum tasks, highlighting the potential of QRC in advancing machine learning.<\/p>\n <\/p>\n <\/p>\n <\/p>\n Altermagnets are a novel class of magnetic materials distinct from ferromagnets and antiferromagnets, characterized by vanishing net magnetization and unique spin-split band structures \u2013 appealing features for exotic quantum phenomena and spintronics applications. This talk explores the interplay between altermagnetism and superconductivity, focusing on how impurities can serve as local probes of altermagnetic superconductors. I will briefly introduce altermagnetic materials, their interplay with superconductivity, and review the basic theory of impurity states in superconductors. I will then present our original theoretical work on the role of impurities in altermagnetic superconductors, predicting the emergence of spin-polarized subgap states that extend along the crystal axes. These states form degenerate doublets, which can be split by crystal symmetry breaking or a magnetic field aligned with the N\u00e9el vector. Their unique spatial and spin properties provide measurable signatures via scanning tunneling microscopy, serving as a hallmark for altermagnetic superconductivity. Finally, I will discuss the interaction between impurities, revealing a position-dependent, spin-selective coupling that enables in-situ control of devices crucial for quantum information processing and topological superconductivity.<\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n The interaction between ionizing radiation and oxide-water interfaces is a key topic in material science research in the quest for materials with technological applications, such as nuclear waste management, metal corrosion in aqueous environments, and biological systems exposed to radiation. This talk will explore atomic-level processes occurring at these interfaces, with particular emphasis on hydrogen generation in oxides such as zirconia and copper oxide, both of which are used in nuclear facilities.<\/p>\n The current challenges in understanding the mechanisms behind these processes through electronic structure methodologies will be discussed, including density functional theory (DFT) and many-body perturbation theory (MBPT) approaches, such as the GW approximation and the Bethe-Salpeter equation (BSE). Our preliminary results in these materials, focusing on excitonic properties and radiation-induced processes, will also be presented.<\/p>\n This work is part of the Horizon project titled “Materials Radiation: From Basics to Applications” (MAMBA), which aims to deepen the understanding of material responses to irradiation and apply this knowledge to tailor and control the properties of materials exposed\u2014either intentionally or unintentionally\u2014to intense radiation environments. Finally, the talk will outline the future steps in this research, including modeling different oxide facets, analyzing excitonic wave functions, and using machine learning to describe the corresponding oxide-water interfaces.<\/p>\n <\/p>\n Quantum computing has reached a critical moment. On the one hand, quantum hardware are continuously advancing. On the other hand, quantum computational advantage over classical computing has not yet been available for practical problems. Moreover, the road to universal quantum computing is still long. The highly anticipated quantum variational algorithm is still constrained by a small number of qubits and shallow circuits. Some scholars even think that “NISQ is dead”. In this talk, based on the applications of quantum-inspired algorithms, we introduce the concept of quantum acceleration algorithms and discuss how NISQ quantum hardware can act as an accelerator and add to the value of quantum computing through the mixture with classical computing.<\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n With the advent of attosecond light pulses at the dawn of the twenty first century, access to the time scale of electronic motion, i.e., the ultimate time scale responsible for chemical transformations, was finally at our reach. Since the first attosecond pump-probe experiments performed in molecules [1,2], the field has grown exponentially, leading to a discipline that we call attochemistry [3]. As a result, it is nowadays possible to follow in real time the motion of the \u201cfast\u201d electronic motion in molecules, mostly in the gas phase, and understand how this motion affects the \u201cslower\u201d motion of atomic nuclei and vice versa. There are, however, new scenarios [4] that will allow one to extend the range of applications to more complex molecular systems, including the condensed phase, and to overcome some of the limitations of current attosecond technologies [5-9], such as the low intensity of attosecond pulses produced by high harmonic generation, the impossibility to generate such pulses in the visible and UV spectral regions to avoid molecular ionization, or the difficulties to combine them with truly<\/span> imaging methods as those used in condensed matter physics for direct time-resolved observations of the electron density without the need for reconstruction from measured photoelectron, photoion or transient absorption spectra. <\/span><\/p>\n In this talk, I will describe current experimental and theoretical efforts aiming at overcoming the above-mentioned limitations, thus giving attochemistry the necessary push to investigate problems of real chemical interest.<\/span><\/p>\n The highly complex collective electron-dynamics in strongly correlated materials mandates experimental techniques with sub-fs temporal and nanometer spatial resolution. While a plethora of techniques exists, true nanometer imaging on fs or even sub-fs timescales remains elusive. Such techniques are required to follow the collective dynamics of electrons in strongly correlated materials in real time, which drive ultrafast phase transitions that are accompanied by technologically relevant order-of-magnitude resistivity switches. References: 30 years ago, the appropriate quantum transport theories, basis sets, algorithms, user interfaces, and dissemination methods for quantum device modeling were subjects of intense debate and uncertainty. The development of the Nanoelectronic MOdeling (NEMO) toolset commenced in 1994 at Texas Instruments, continued in 1998 and NASA\/JPL, and has been ongoing at Purdue since 2004. Modern nanoscale transistor design extensively employs advanced quantum transport modeling tools, representing physical devices in three dimensions with atomistic basis sets. The NEMO implementations of the Non-Equilibrium Green Function (NEGF) formalism with atomistic tight-binding basis have become the benchmark for quantitative and predictive device simulation. This methodology has now been widely adopted by most device modeling research teams. In 2015, Intel integrated NEMO5 into their in-house design suite, utilizing a top-100 ranked supercomputer for design explorations [1]. Silvaco initiated commercialization efforts [2] in 2018, with industry leaders such as Samsung and TSMC developing their in-house solutions based on NEMO. NEMO\u2019s capability to accurately model crystal orientations and strain in complex systems facilitated the development of Texas Instruments’ rotated substrate technology in 2004 [3], significantly impacting chips used in billions of cell phones. Contemporary 3D FinFETs [4] and nanosheet transistors share the 5 nm central length characteristics with 1D resonant tunneling diodes (RTDs). The quantitative and predictive modeling of 1D RTDs (1994-1997) established the standards necessary for today’s 3D nano-transistors.<\/p>\n NEMO’s applications extend beyond usage by experts equipped with specialized computational hardware. Over 25,000 users on nanoHUB.org, the pioneering comprehensive scientific computing cloud platform, have investigated various nanoscale devices such as nanowires, ultra-thin-body transistors, and quantum dots utilizing the intuitive NEMO\/OMEN tools. These tools are supplemented by straightforward applications, rendering them accessible to a broad spectrum of users. Notably, more than fifty percent of nanoHUB’s simulation users participate in formal educational settings across 1,000 institutions globally, immersing themselves in device exploration and modeling principles. nanoHUB hosts 700+ apps and tools, along with over 170 courses.<\/p>\n This presentation will provide an overview of the critical physical phenomena needed to be captured for realistic device design, how high-performance-computing can deliver results to engineers & students, and how NEMO has been deployed on nanoHUB.org.<\/p>\n This work would not have been possible without my hundreds of collaborators who helped to build, test drive, break, and rebuild NEMO\/OMEN [5-9,12-14] and nanoHUB [10,11].\u00a0 I have the deepest appreciation for their hard work, dedication and in most cases their personal friendship. The citations here just cover some of the fundamental developments. Citations to these papers lead to hundreds of publications enabled by my collaborators and friends.<\/p>\n [1] Mark Stettler et al., IEDM, 39.1.1 (2019) Long searched but only now discovered two-dimensional (2D) magnets are one of the selected group of materials that retain or impart strongly spin correlated properties at the limit of atomic layer thickness. In this presentation, I will discuss how different layered compounds (e.g., CrX3 (X=F, Cl, Br, I), MnPS3, Fe5-xGeTe2, Cr2Ge2Te6) can provide new playgrounds for applications and fundamental exploration of spin correlations involving quantum-effects, topological spin-excitations and ultrafast laser pulses. In particular, I will show how van der Waals magnets do not require any magnetic anisotropy to stabilize 2D magnetism and demonstrate the null valid of the Mermin-Wagner theorem in practical applications. Moreover, some recent results of ultrafast laser excitations on different vdW heterostructures will be shown towards all-optical control of their magnetic properties with efficient heat management.<\/p>\n The use of cavity quantum electrodynamical effects, i.e., of vacuum electromagnetic fields, to modify material properties has rapidly gained popularity and interest in the last decade. A canonical example of this is strong light-matter coupling, reached when the interaction of material excitations with confined light modes overcomes dissipation effects and the two parts hybridize to form mixed light-matter eigenstates, so-called polaritons. These polaritons inherit properties of both light and matter excitations and additionally display fundamentally new phenomena. The large range of possible material systems and cavity architectures opens a rich playground for novel functionalities. In the talk, I will discuss several topics related to this overall field, including the modification and photophysics and photochemistry in organic molecules, some fundamental results and pitfalls for the modification of low-energy excitations, and recent progress on few-mode field quantization in complex nanophotonic structures, i.e., strategies to obtain the construction of cavity-QED-like models for arbitrary cavity geometries and materials.<\/p>\n Quantum sensing uses quantum properties of matter to enhance the sensitivity in precision measurements. Besides others, it already finds important applications in atomic clocks, for medical purposes, and in the search for dark matter. Many currently employed quantum sensing protocols exhibit a simple setup, in which a laser probes the optical properties of an ensemble of atoms, molecules, or other quantum emitters, which are subject to the external stimulus to be measured. An important figure of merit to predict the sensitivity is the signal-to-noise ratio.\u00a0 While it is easy to theoretically calculate the signal, the accurate prediction of the noise is challenging.<\/p>\n Motivated by this, we have developed the Photon-Resolved Floquet Theory (PRFT), which besides predicting the state of a driven quantum system (e.g., the atom or molecule), can also predict the number of photons exchanged with the coherent driving field [1,2]. To this end, the PRFT introduces counting fields into the semiclassical equations of motions, that track the photons in the driving field.\u00a0 Interestingly, the PRFT predicts light-matter entanglement in the Floquet-state basis. This effect can be employed to devise a measurement-based quantum communication protocol, which has favorable scaling properties over long distances. \u00a0We apply the PRFT to spectroscopy, where it can predict the Fisher information of coherent spectroscopic signals [3]. The PRFT thus opens new paths to design and optimize quantum sensors based on AMO systems, which might assist in the discovery of new physics.<\/p>\n
\n[2] Nandi, S., et al<\/em>. Generation of entanglement using a short-wavelength seeded free-electron laser. Sci. Adv.10, eado0668 (2024).
\n[3] Stenquist, A. and Dahlstr\u00f6m, J. M. . Harnessing time symmetry to fundamentally alter entanglement in photoionization. Phys. Rev. Research 7, 013270 (2025).<\/p>\n<\/div>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2025\/03\/DavidAyusoFoto-226x300.png\")
<\/p>\nDavid Ayuso<\/h1>\n
Department of Chemistry, Molecular Sciences Research Hub,\u00a0 Imperial College London, W12 0BZ London, UK<\/h3>\n
Ultrafast chirality<\/em>: shaping light in 3D to twist electrons on a sub-femtosecond timescale<\/strong><\/h2>\n
When: 11:00-12:00 CET, April 9th (Wednesday), 2025<\/h4>\n
Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
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\n[2] Y. Liu et al, Nature Reviews Chemistry 7, 355 (2023)
\n[3] D. Ayuso et al, Phys Chem Chem Phys 24, 26962 (2022)
\n[4] D. Ayuso et al, Nature Photonics 13, 866 (2019)
\n[5] D. Ayuso et al, Nature Communications 12, 3951 (2021)
\n[6] J. Vogwell et al, Science Advances 9, eadj1429 (2023)
\n[7] D. Ayuso et al, Optica 8, 1243 (2021)
\n[8] L. Rego et al, Nanophotonics 12, 14, 2873 (2023)
\n[9] N. Mayer et al, Nature Photonics 18, 1155 (2024)
\n[10] J. Terentjevas et al, ArXiv:2406.14258v1 (2024)
\n[11] A. Ord\u00f3\u00f1ez et al, ArXiv:2309.02392 (2023)<\/p>\n<\/div>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2025\/02\/foto_juantorres-235x300.jpeg\")
<\/p>\nJuan Torres Luna<\/h1>\n
TU Delft – Quantum Tinkerer group<\/h3>\n
Understanding the fate of the poor man’s Majorana in the long-chain limit<\/strong><\/h2>\n
When: 12:00-13:00 CET, February 18th (Tuesday), 2025<\/h4>\n
Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
The quality of topological qubits based on Majorana bound states (MBS) depends uniquely on two properties: the size of the topological gap and the MBS localization length. While the Kitaev model features perfectly localized MBS and a maximal gap, realistic systems exhibit finite localization length and the gap is limited by proximity effect, which raises the question of what platform can realise the best MBS. In this work, we study the quality of MBS in two platforms: the Lutchyn-Oreg (LO) model and the quantum dot chain model.<\/div>\nFor the quantum dot chain, we find a trade-off between weak coupling—where the gap is small and the localization length is small—and the strong coupling regime—where the gap is large and the localization length is large. For the LO model, we find that the interplay between spin-orbit coupling and momentum yields a gap and localization length that cannot be simultaneously optimized. In order to find the best MBS that each model can achieve, we use multi-objective optimization to find the set of optimal localization lengths and gaps. We demonstrate that quantum dot chains can achieve MBS quality comparable to nanowire models, with extra tunability of the gap and localization. Our results highlight quantum dot chains as a versatile platform for high-quality MBS and topological quantum computing.<\/div>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/12\/Rahmani.jpeg\")
<\/p>\nAmir Rahamni<\/h1>\n
Instytut Fizyki PAN, Warsaw, Poland<\/h3>\n
Quantum Many-Body Interactions and Light-Matter Coupling: Expanding the Frontier of Reservoir Computing and Machine Learning<\/strong><\/h2>\n
When: 12:00-13:00 CET, December 2nd (Tuesday), 2024<\/h4>\n
Where: Sala de Juntas, ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/11\/andrea-300x300.jpg\")
<\/h1>\nAndrea Maiani<\/h1>\n
WINQ Postdoctoral fellow, Nordita.<\/h3>\n
Impurity States in Altermagnetic Superconductors<\/strong><\/h2>\n
When: 12:00-13:00 CET, November 26th (Tuesday), 2024<\/h4>\n
Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/10\/NataliaBerloff.jpeg\")
<\/p>\nNatalia Berloff<\/strong><\/h1>\n
Department of Applied Mathematics and Theoretical Physic, University of Cambridge, UK<\/h3>\n
<\/h5>\n
Non-Hermitian Gain-Based Computing with Coupled Light-Matter Systems\u00a0<\/b><\/h2>\n
When: 12:00-13:00 CET, November 7th (Thursday), 2024<\/h4>\n
Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
Gain-based computing utilizing non-Hermitian dynamics\u00a0in light-matter interactions presents a novel approach to physics-based hardware and physics-inspired algorithms. By encoding complex optimization problems into the gain and loss rates of driven-dissipative systems,\u00a0we leverage non-Hermiticity to destabilize non-optimal states and guide the system toward the global minimum. The incorporation of prior knowledge about ground state energies into the complex part of the energy enhances the system’s ability to navigate complex energy landscapes.<\/div>\nIn this paradigm, the system undergoes symmetry-breaking transitions\u00a0on a dynamically changing loss landscape, selecting modes that minimise losses and manifesting the optimal solutions to the original problems. This approach enables solving significant combinatorial optimization problems via mapping to Ising, XY, and k-local Hamiltonians, applicable across various physical platforms, including photonic, electronic, and atomic systems.<\/div>\n\u00a0Despite advancements, critical questions remain regarding scalability, the impact of phase space structures on system performance, and the identification of problems best suited for these unconventional computing architectures. I will address these challenges in my talk by understanding the dynamic behaviour during symmetry-breaking transitions, optimizing trajectories toward global minima, quantifying error probabilities, and using dissipation and nonlinearities to correct errors.<\/div>\n\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2025\/06\/HugoAramberri-263x300.png\")
<\/p>\n<\/div>\n\nHugo Aramberri <\/strong><\/h1>\n
Luxembourg Institute of Science and Technology (LIST)<\/h3>\n
<\/h5>\n
Brownian electric bubble quasiparticles and topological phase transitions in frustrated ferroelectrics\u00a0<\/b><\/h2>\n
When: 12:00-13:00 CET, November 14th (Thursday), 2024<\/h4>\n
Where: Sala de Juntas, ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n<\/div>\n
<\/div>\nElectrostically frustrated ferroelectrics have become an exciting playground for new physics. In these systems, the delicate balance between electrostatic, elastic and domain wall energies can make the system highly responsive, and can give rise to diverse dipole topologies. A notable breakthrough was the recent realization of electric skyrmion bubbles in ferroelectric\/dielectric superlattices (PbTiO3<\/sub>\/SrTiO3<\/sub>)[1]<\/sup>. Interestingly, the topology of the dipole field can be manipulated through external stimuli like temperature and electric fields[2]<\/sup>, and also by tuning heterojunction design parameters like layer thicknesses and epitaxial strain.<\/div>\n<\/div>\nIn this talk I will present our recent contributions to this field. First, I will discuss a temperature-driven topological phase transition of the dipolar order that mirrors the two-step melting process seen in some liquid crystals[3]<\/sup>. Second, I will introduce our recent prediction that electric bubble domains behave as Brownian particles, exhibiting thermally activated diffusive motion[4]<\/sup>, similar to magnetic skyrmions. I will also share our latest calculations on bubble manipulation and outline our ongoing efforts to understand their dynamical behaviour.<\/div>\n<\/div>\n\n[1] S. Das et al., Nature 568<\/b>,\u00a0 368 (2019).<\/div>\n[2] J. Junquera et al., Rev. Mod. Phys. 95<\/b>, 025001 (2023).<\/div>\n[3] F. G\u00f3mez-Ortiz, M. Graf, J. Junquera, J. \u00cd\u00f1iguez-Gonz\u00e1lez, H. Aramberri, Phys. Rev. Lett. 133<\/b>, 066801 (2024).<\/div>\n[4] H. Aramberri & J. \u00cd\u00f1iguez-Gonz\u00e1lez, Phys. Rev. Lett. 132<\/b>, 136801 (2024).<\/div>\n<\/div>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/10\/ValeriaFerrari-200x300.jpeg\")
<\/p>\nValeria Ferrari<\/strong><\/h1>\n
Departamento de F\u00edsica de la Materia Condensada, Comisi\u00f3n Nacional de Energ\u00eda At\u00f3mica (CNEA).\u00a0Consejo Nacional de Investigaciones Cient\u00edficas y T\u00e9cnicas (CONICET).\u00a0Instituto de Nanociencia y Nanotecnologia (CNEA-CONICET)<\/h3>\n
<\/h5>\n
Radiation Effects at Oxide-Water Interfaces: Current Insights and Future steps\u00a0<\/b><\/h2>\n
When: 12:00-13:00 CET, October 31th (Thursday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
<\/h3>\n
![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/10\/Hong.jpeg\")
<\/h3>\nManhong Yung<\/strong><\/h1>\n
Southern University of Science and Technology, China<\/h3>\n
From quantum inspired to quantum speedup<\/b><\/h2>\n
When: 12:00-13:00 CET, October 17th (Thursday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
———————————-<\/h2>\n
![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/10\/Fernando_Martin_UAM-214x300.jpg\")
<\/h2>\nFernando Mart\u00edn<\/strong><\/h2>\n
Departamento de Qu\u00edmica, Universidad Aut\u00f3noma de Madrid, 28049 Madrid, Spain<\/h3>\n
Instituto Madrile\u00f1o de Estudios Avanzados en Nanociencia (IMDEA-Nano), 28049 Madrid, Spain<\/h3>\n
Attochemistry: chemistry at the attosecond time scale<\/b><\/h2>\n
When: 12:00-13:00 CET, October 10th (Thursday), 2024<\/h4>\n
Where: Sal\u00f3n de Actos, ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
References:\r\n[1] G. Sansone, F. Kelkensberg, J. F. P\u00e9rez-Torres, F. Morales, M. F. Kling, W. Siu, O. Ghafur, P. Johnsson, M. Swoboda, E. Benedetti, F. Ferrari, F. L\u00e9pine, J. L. Sanz-Vicario, S. Zherebtsov, I. Znakovskaya, A. L\u2019Huillier, M. Yu. Ivanov, M. Nisoli, <\/span>F. Mart\u00edn<\/span>, and M. J. J. Vrakking, <\/span>Nature<\/span> 465<\/span> 763 (2010).<\/span>\r\n\r\n[2] F. Calegari, D. Ayuso, A. Trabattoni, L. Belshaw, S. De Camillis, S. Anumula, F. Frassetto, L. Poletto, A. Palacios, P. Decleva, J. B. Greenwood, <\/span>F. Mart\u00edn<\/span>, and M. Nisoli<\/span>, <\/span>Science<\/span> 346<\/span>, 336 (2014).<\/span>\r\n\r\n[3] M. Nisoli, P. Decleva, F. Callegari, A. Palacios, and F. Mart\u00edn, <\/span>Chem. Rev.<\/span> 117<\/span>, 10760 (2017).<\/span>\r\n\r\n[4] F. Calegari and F. Mart\u00edn, Commun. Chem. 6, 184 (2023).\r\n\r\n[5] A. <\/span>Palacios and F. Mart\u00edn, WIREs Comput. Mol. Sci. e1430 (2020).\r\n\r\n[6] G. Grell, Z. Guo, T. Driver, P. Decleva, E. Ple\u0301siat, A. Pico\u0301n, J. Gonza\u0301lez-Va\u0301zquez, P. Walter, J. P. Marangos, J. P. Cryan, A. Marinelli, A. Palacios, and F. Marti\u0301n, <\/span>Phys. Rev. Res<\/span>. <\/span>5<\/span>,<\/span> 023092 (2023).<\/span>\r\n\r\n[7] M. Galli et al, Optics Letters 44, 1308 (2019).\r\n\r\n[8] M. Reduzzi et al, Optics Express 31, 26854 (2023).\r\n\r\n[9] M. Garg, A. Mart\u00edn-Jim\u00e9nez, M. Pisarra, Y. Luo, F. Marti\u0301n and K. Kern, <\/span>Nature Photonics <\/span>16,<\/span> 196 (2022).\r\n\r\n[10] F. Vismarra, F. Fern\u00e1ndez-Villoria, D. Mocci, J. Gonz\u00e1lez-V\u00e1zquez, Y. Wu, L. Colaizzi, F. Holzmeier, J. Delgado, J. Santos, L. Ba\u00f1ares, L. Carlini, M. Castrovilli, P. Bolognesi, R. Richter, L. Avaldi, A. Palacios, M. Lucchini, M. Reduzzi, R. Borrego- Varillas, N. Mart\u00edn, F. Mart\u00edn, and M. Nisoli, Nature Chemistry in press.<\/span><\/pre>\n———————————–<\/h2>\n
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<\/h2>\nPeter Kraus<\/strong><\/h2>\n
Vrije Universiteit (VU) Amsterdam, Advanced Research Center for Nanolithography (ARCNL), Netherlands<\/h3>\n
Towards ultrafast imaging of correlated matter with transient high-harmonic generation<\/b><\/h2>\n
When: 12:00-13:00 CET, October 1st (Tuesday), 2024<\/h4>\n
Where: Main Hall, ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
\nHigh-harmonic generation (HHG) in solids has emerged 14 years ago. Gas-phase HHG is highly sensitive and thus optically controllable with regards to the microscopic generation
\nmechanism. The parallels between solid and gas-phase HHG suggest that solid-state HHG may be controlled in a similar manner, which enables a generally applicable all-optical light switch with wide application potential. The current literature on transient solid-state HHG confirms this opportunity of all-optical control of solid HHG [1]. In this talk, I will present our vision to use this light switch for sub-fs super-resolution nanoscale imaging by HHG from correlated materials. In particular, I will present three key experiments on our roadmap towards this goal.
\nOn the nanoscale, we controlled HHG via engineering the surface topography of solids, which in turn demonstrates how solid HHG can be used for metrology on surfaces and tailored as a light source [2-4].
\nOn the femtosecond time scale, we used the sensitivity of HHG to electronic band structure to follow ultrafast phase transitions in strongly correlated materials [5], and photocarrier dynamics in perovskites [6]. While the first measurements [2] showed nanoscale sensitivity, the second set of experiments [5,6] demonstrated that photoexcitation can be used to control light emission via solid HHG.
\nCombining both efforts, I will show first results how ultrafast control of solid HHG enables
\nHArmonic DEactivation microScopy (HADES) – a label-free super-resolution microscopy
\nbelow the diffraction limit of light [7]. Thinking ahead, the development of these techniques may enable resolution on the nanometer and femto- to attosecond scale fitted into a regular microscopy setting, with application potential ranging from strongly correlated materials to semiconductor metrology, photosynthetic processes, and medical imaging.<\/p>\n
\n[1] P. v. Essen, Z. Nie, B. de Keijzer, P.M. Kraus, arXiv:2402.15375, ACS Photonics, accepted\u00a0 (2024).
\n[2] S.D.C. Roscam Abbing, R. Kolkowski, Z.-Y. Zhang, F. Campi, L. Loetgering, A.F. Koenderink, P.M. Kraus,
\nPhysical Review Letters 128, 223902 (2022).
\n[3] P. M. Kraus et al., US Patent App. 18\/038,590 (2024).
\n[4] P. M. Kraus et al., US Patent App. 18\/253,734 (2024).
\n[5] Z. Nie et al., Peter M. Kraus, Physical Review Letters, 131, 243201 (2023).
\n[6] M. v.d. Geest, J.J. de Boer, K. Murzyn, P. Juergens, B. Ehrler, P.M. Kraus, Journal of Phys. Chem. Lett., 14, 10810 (2023).
\n[7] K. Murzyn, M.v.d. Geest, L. Guery, Z. Nie, P.v. Essen, S. Witte, P.M. Kraus, arXiv:2403.06617, submitted (2024).<\/p>\n<\/h2>\n
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<\/h2>\nGerhard Klimeck<\/h2>\n
Purdue University, West Lafayette, IN 47907, USA <\/em><\/h3>\n
From Atomistic, Non-Equilibrium Quantum Statistical Mechanics Theory
\nto Today\u2019s Transistor Design and Global Impact \u2013 A 25-Year Journey<\/strong><\/h2>\nWhen: 11:00-12:00 CET, September 18th (Wednesday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
\n[2] Silvaco \u2013 Victory Atomistic, silvaco.com
\n[3] RC Bowen et al., US patent 7,268,399 (2004)
\n[4] G. Yeap et al., IEDM, 36.7.1 (2019)
\n[5] G. Klimeck, et al., APL Lett. 67, 2539 (1995)
\n[6] RC Bowen, et al., JAP 81, 3207 (1997)
\n[7] Jing Wang, et al., APL. 86, 093113 (2005)
\n[8] M Luisier, et al., Phys. Rev. B 74, 205323 (2006)
\n[9] G Klimeck el al, Superlatt. and Microstr., 27, 77, (2000)
\n[10] G Klimeck, et al, IEEE CISE, Vol. 10, 17 (2008)
\n[11] M. Hunt et al, PLoS ONE 17(3): e0264492.
\n[12] R Lake, et al.,JAP 81, 7845 (1997)
\n[13] G. Klimeck, et al, Computer Modeling in Engineering and Science (CMES) 3, 601-642 (2002).
\n[14] S Steiger et al., IEEE Tr. Nanotechn., 10, 1464, (2011)<\/p>\n—————————–<\/h2>\n
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<\/h4>\nElton J. G. Santos<\/h2>\n
Higgs Centre for Theoretical Physics,\u00a0<\/i><\/span>Institute for Condensed Matter and Complex Systems <\/i>– School of Physics and Astronomy, The University of Edinburgh, UK<\/i><\/span><\/h2>\n
Exploring the Limits of Ultrafast Magnetism in Quantum Materials <\/b><\/h2>\n
When: 12:00-13:00 CET, June 5th (Wednesday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
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<\/h4>\nRicardo Lobo<\/h2>\n
ESPCI Paris – PSL University – CNRS – Sorbonne Universit\u00e9, France<\/span><\/h2>\n
Correlations and dispersive Dirac physics in the quantum material family BaCoS2-BaNiS2 \u2013 Reverse band-structure engineering of the optical conductivity<\/b><\/h2>\n
When: 12:00-13:00 CET, May 30th (Thursday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
BaCoS2 and BaNiS2 are the end members of a solid solution that shows a vast array of quantum properties. The Co material is close to a strongly correlated insulator with an antiferromagnetic transition, as well as a structural phase transition, around room temperature. At 28% Ni doping this material undergoes an electronic metal-insulator phase transition to a Drude metal. The metallic state persists all the way to the pure Ni compound. At this point, in addition to a Drude peak, we observe a strong contribution from bands with linear dispersion at the Fermi level, which give origin to dispersive Dirac nodal lines. We measured the optical conductivity of these materials and combined them with ab-initio calculations to reverse engineer the role of each band in the physical response of these materials. We explained uncommon features in their optical response such as a linear dispersion of the optical conductivity [1] and the existence of an isosbestic line separating a spectral-weight transfer across Dirac nodal states [2].<\/span>
[1] D. Santos-Cottin, Y. Klein, P. Werner, T. Miyake, L. de\u2019Medici, A. Gauzzi, R.P.S.M. Lobo, and M. Casula, Linear behavior of the optical conductivity and incoherent charge transport in BaCoS2, Phys. Rev. Materials 2, 105001 (2018). arXiv: 1712.01539.<\/span>
[2] D. Santos-Cottin, M. Casula, L. de\u2019Medici, F. Le Mardel\u00e9, J. Wyzula, M. Orlita, Y. Klein, A. Gauzzi, A. Akrap, and R.P.S.M. Lobo, Optical conductivity signatures of open Dirac nodal lines, Phys. Rev. B 104, L201115 (2021). arXiv: 2104.05521.<\/span><\/p>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/03\/jfeist-300x300.jpg\")
<\/h4>\nJohannes Feist<\/strong><\/h2>\n
Department of Theory of Condensed Matter Physics, Universidad Autonoma de Madrid, Spain<\/h3>\n
Using cavities to modify material properties<\/b><\/h2>\n
When: 12:00-13:00 CET, April 25th (Thursday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
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<\/h2>\nGeorg Engelhardt<\/strong><\/h2>\n
Southern University of Science and Technology in the Shenzhen Institute of Quantum Science and Engineering<\/span><\/h3>\n
Photon-Resolved Floquet Theory and its application to quantum sensing<\/strong><\/h2>\n
When: 12:00-13:00 CET, April 11th (Thursday), 2024<\/h4>\n
Where: Seminar Room (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
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Christopher W. W\u00e4chtler\u00a0<\/strong><\/h2>\n![\"\"](\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2024\/03\/Paloma-300x300.jpg\")
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<\/strong><\/h2>\n![](\"https:\/\/www.icmm.csic.es\/sites\/default\/files\/personal\/belenValenzuela.jpg\")
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