{"id":3730,"date":"2026-04-30T13:03:55","date_gmt":"2026-04-30T11:03:55","guid":{"rendered":"https:\/\/equipes.lps.u-psud.fr\/meso\/?p=3730"},"modified":"2026-04-30T13:03:56","modified_gmt":"2026-04-30T11:03:56","slug":"chern-junctions-in-moire-patterned-graphene-pbi2","status":"publish","type":"post","link":"https:\/\/equipes.lps.u-psud.fr\/meso\/chern-junctions-in-moire-patterned-graphene-pbi2\/","title":{"rendered":"Chern junctions in Moir\u00e9-Patterned Graphene\/PbI2"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Two-dimensional moir\u00e9 superlattices, formed by stacking atomically thin crystals with slight rotational misalignment, provide a powerful platform for engineering emergent electronic phenomena. <\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">Here, we demonstrate that incorporating lead iodide (PbI\u2082), a layered semiconductor with strong spin\u2013orbit coupling, significantly enriches the physics of such systems. We fabricate a van der Waals heterostructure consisting of four PbI\u2082 layers beneath hexagonal boron nitride and graphene, with controlled rotational alignment. Unlike conventional graphene-based heterostructures, which exhibit insulating behavior at the charge neutrality point (CNP), our device shows nearly dissipationless transport under high magnetic fields. We observe a robust fractional quantum Hall conductance plateau at 2\/3 e\u00b2\/h, along with quantum interference effects. These findings indicate the emergence of strongly correlated electronic states and suggest that moir\u00e9-induced modifications, combined with proximity-enhanced spin\u2013orbit coupling, stabilize a high-field topological insulating phase and enable ballistic electron transport.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"486\" height=\"322\" src=\"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/04\/PbI2.png\" alt=\"\" class=\"wp-image-3732\" srcset=\"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/04\/PbI2.png 486w, https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/04\/PbI2-300x199.png 300w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Reference<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yan Sun, M. Monteverde, V. Derkach, K. Watanabe, T. Taniguchi, F. Chiodi, H. Bouchiat, and A. D. Chepelianskii, Chern junctions in moir\u00e9-patterned graphene\/PbI2, <a href=\"https:\/\/dx.doi.org\/10.1103\/lngp-twfc\"><u>Phys. Rev. B\u00a0<strong>113<\/strong>, 155425 (2026)<\/u><\/a>.[<a href=\"https:\/\/arxiv.org\/abs\/2508.04935\">arXiv\/2508.04935<\/a>]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Two-dimensional moir\u00e9 superlattices, formed by stacking atomically thin crystals with slight rotational misalignment, provide a powerful platform for engineering emergent electronic phenomena.<\/p>\n","protected":false},"author":18,"featured_media":3732,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,11],"tags":[],"class_list":["post-3730","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-highlights","category-news"],"_links":{"self":[{"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts\/3730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/comments?post=3730"}],"version-history":[{"count":2,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts\/3730\/revisions"}],"predecessor-version":[{"id":3733,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts\/3730\/revisions\/3733"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/media\/3732"}],"wp:attachment":[{"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/media?parent=3730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/categories?post=3730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/tags?post=3730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}