{"id":463,"date":"2025-06-05T13:38:25","date_gmt":"2025-06-05T13:38:25","guid":{"rendered":"https:\/\/wp.icmm.csic.es\/seminars\/?p=463"},"modified":"2025-06-05T13:38:25","modified_gmt":"2025-06-05T13:38:25","slug":"juan-pablo-esparza","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/seminars\/2025\/06\/05\/juan-pablo-esparza\/","title":{"rendered":"Juan Pablo Esparza\u00a0"},"content":{"rendered":"

\"\"<\/p>\n

Juan Pablo Esparza<\/h1>\n

Departamento de F\u00edsica, Universidad T\u00e9cnica Federico Santa Mar\u00eda<\/h3>\n

 <\/p>\n

Band-flattening phenomena in non-Hermitian systems
\n<\/strong><\/h2>\n

When: 12:00-13:00 CET, June 26th (Thursday), 2025<\/h4>\n

Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n
\n

Flat bands\u2014dispersionless electronic or photonic states\u2014provide unique platforms to study strongly correlated phases and unconventional topology. While their usual realizations rely primarily on Hermitian systems, incorporating non-Hermitian effects introduces fundamentally new routes for flat-band engineering. Here, I will introduce a general method to promote any Dirac-like Hamiltonian to non-Hermitian, preserving its fundamental properties, and provide an explicit application to twisted bilayer graphene, where we discover a new type of magic angle that arises due to the interplay between twisting and non-Hermiticity: the exceptional magic angles. Then, I will discuss how we can apply a similar method to construct perfectly flat bands in non-Hermitian crystalline systems within the framework of bipartite crystalline lattices. Our results suggest the robustness of the flat bands in open quantum systems, paving the way for the further studies on the interplay of dissipative effects, electronic topology, and interactions in non-Hermitian systems.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Juan Pablo Esparza Departamento de F\u00edsica, Universidad T\u00e9cnica Federico Santa Mar\u00eda   Band-flattening phenomena in non-Hermitian systems When: 12:00-13:00 CET, June 26th (Thursday), 2025 Where: Sala de Seminarios (182), ICMM-CSIC, Campus de Cantoblanco, Madrid Flat bands\u2014dispersionless electronic or photonic states\u2014provide unique platforms to study strongly correlated phases and unconventional topology. While their usual realizations rely … Continue reading Juan Pablo Esparza\u00a0<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":103,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-463","post","type-post","status-publish","format-standard","hentry","category-sin-categoria"],"_links":{"self":[{"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts\/463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/users\/103"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/comments?post=463"}],"version-history":[{"count":1,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts\/463\/revisions"}],"predecessor-version":[{"id":464,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts\/463\/revisions\/464"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/media?parent=463"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/categories?post=463"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/tags?post=463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}