{"id":237,"date":"2023-09-28T08:47:26","date_gmt":"2023-09-28T08:47:26","guid":{"rendered":"https:\/\/wp.icmm.csic.es\/seminars\/?p=237"},"modified":"2024-04-18T09:03:22","modified_gmt":"2024-04-18T09:03:22","slug":"nicolas-leconte-18-09-2023","status":"publish","type":"post","link":"https:\/\/wp.icmm.csic.es\/seminars\/2023\/09\/28\/nicolas-leconte-18-09-2023\/","title":{"rendered":"Nicolas Leconte (18\/09\/2023)"},"content":{"rendered":"<h2 style=\"text-align: center\"><\/h2>\n<h2 style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-239 aligncenter\" src=\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2023\/09\/Leconte.jpeg\" alt=\"\" width=\"301\" height=\"301\" srcset=\"https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2023\/09\/Leconte.jpeg 301w, https:\/\/wp.icmm.csic.es\/seminars\/wp-content\/uploads\/sites\/61\/2023\/09\/Leconte-150x150.jpeg 150w\" sizes=\"auto, (max-width: 301px) 100vw, 301px\" \/><\/h2>\n<h2 style=\"text-align: center\"><strong>Nicolas Leconte<\/strong><\/h2>\n<h3 style=\"text-align: center\"><\/h3>\n<h3 style=\"font-weight: 400;text-align: center\"><strong>University of Seoul, Korea<\/strong><\/h3>\n<h2 style=\"text-align: center\">Open-orbit induced extreme magnetoresistance and fractional Chern insulator in graphene\/h-BN<br \/>\nsuperlattices at low fields<\/h2>\n<h4 style=\"text-align: center\">When: 12:00-13:00 CET, June 20th (Tuesday), 2024<\/h4>\n<h4 style=\"text-align: center\">Where: Seminar Room, ICMM-CSIC, Campus de Cantoblanco, Madrid<\/h4>\n<p>In this talk, I will discuss our recent work where we report on the hitherto unexplored low magnetic field regime in ultrahigh-quality graphene\/h-BN superlattices where intrinsic band structure features perturb the single-band Hofstadter butterfly picture. For magnetic fields as low as 0.1 \u2212 1 Tesla, we uncover extreme magnetoresistance patterns, attributed to the formation of open orbits at Lifshitz transitions, providing a truly 2D experimental realization of the commonly discussed 2D theoretical open-orbit models, and illustrated through a real-space analysis of the current densities. We further observe trigonal warping-induced Landau level splitting near the secondary Dirac point in monolayer graphene superlattice, where enhanced many-body effects induce a fractional Chern insulator, a primer at such low magnetic fields. Finally, a transition from linear to parabolic Landau level dispersion is uncovered, a phenomenon we link to miniband overlap through a semiclassical analysis. Our combined theoretical-experimental study provides insights into the intricacies of the low-field fractal spectrum ahead of the quantum Hall regime.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nicolas Leconte University of Seoul, Korea Open-orbit induced extreme magnetoresistance and fractional Chern insulator in graphene\/h-BN superlattices at low fields When: 12:00-13:00 CET, June 20th (Tuesday), 2024 Where: Seminar Room, ICMM-CSIC, Campus de Cantoblanco, Madrid In this talk, I will discuss our recent work where we report on the hitherto unexplored low magnetic field regime &hellip; <a href=\"https:\/\/wp.icmm.csic.es\/seminars\/2023\/09\/28\/nicolas-leconte-18-09-2023\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Nicolas Leconte (18\/09\/2023)<\/span> <span class=\"meta-nav\">&rarr;<\/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-237","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\/237","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=237"}],"version-history":[{"count":6,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts\/237\/revisions"}],"predecessor-version":[{"id":323,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/posts\/237\/revisions\/323"}],"wp:attachment":[{"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/media?parent=237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/categories?post=237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.icmm.csic.es\/seminars\/wp-json\/wp\/v2\/tags?post=237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}