{"id":3720,"date":"2026-03-03T11:09:44","date_gmt":"2026-03-03T10:09:44","guid":{"rendered":"https:\/\/equipes.lps.u-psud.fr\/meso\/?p=3720"},"modified":"2026-03-03T11:09:45","modified_gmt":"2026-03-03T10:09:45","slug":"quantum-coherent-transport-of-1d-ballistic-states-in-second-order-topological-insulator-bi4br4","status":"publish","type":"post","link":"https:\/\/equipes.lps.u-psud.fr\/meso\/quantum-coherent-transport-of-1d-ballistic-states-in-second-order-topological-insulator-bi4br4\/","title":{"rendered":"Quantum Coherent Transport of 1D ballistic states in second order topological insulator Bi4Br4\u00a0\u00a0\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">This work demonstrates the potential of the material Bi4Br4 for low-power electronic devices and provides a robust platform for further exploring the unique properties of high-order topological phases.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">Ballistic conduction in one dimension is excessively rare in nature, yet it is a predicted feature of second-order topological insulators which host conducting channels along the physical hinges of 3D crystals. We investigated quantum transport in micrometer-size single crystals of Bi4\u2062Br4, a promising candidate for second-order topological insulators. Ballistic topological states with long phase coherence times are revealed by quantum interference modulated by magnetic field and gate voltage. This is confirmed by the absence of Hall resistance and the presence of highly nonlocal conduction. These results provide a comprehensive description of transport in Bi4\u2062Br4 and establish that its hinges act as perfectly protected one-dimensional wires. Our work demonstrates the potential of this material for low-power electronic devices and provides a robust platform for further exploring the unique properties of high-order topological phases.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"273\" src=\"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/03\/Fig_PRX_BiBr.png\" alt=\"\" class=\"wp-image-3714\" srcset=\"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/03\/Fig_PRX_BiBr.png 400w, https:\/\/equipes.lps.u-psud.fr\/meso\/wp-content\/uploads\/sites\/8\/2026\/03\/Fig_PRX_BiBr-300x205.png 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Reference<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">J. Lefeuvre, M. Kobayashi, G. Patriarche, N. Findling, D. Troadec, M. Ferrier, S. Gu\u00e9ron, H. Bouchiat, T. Sasagawa, and R. Deblock, Quantum Coherent Transport of 1D Ballistic States in Second-Order Topological Insulator Bi4Br4, <a href=\"https:\/\/link.aps.org\/doi\/10.1103\/2bqq-t7ml\">Phys. Rev. X <strong>16<\/strong>, 011031 (2026)<\/a>.[<a href=\"https:\/\/doi.org\/10.48550\/arXiv.2502.13837\">arXiv:2502.13837<\/a>]<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This work demonstrates the potential of the material Bi4Br4 for low-power electronic devices and provides a robust platform for further exploring the unique properties of high-order topological phases.<\/p>\n","protected":false},"author":18,"featured_media":3714,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,11],"tags":[],"class_list":["post-3720","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\/3720","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=3720"}],"version-history":[{"count":1,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts\/3720\/revisions"}],"predecessor-version":[{"id":3721,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/posts\/3720\/revisions\/3721"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/media\/3714"}],"wp:attachment":[{"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/media?parent=3720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/categories?post=3720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/equipes.lps.u-psud.fr\/meso\/wp-json\/wp\/v2\/tags?post=3720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}