{"id":60,"date":"2016-09-12T10:42:06","date_gmt":"2016-09-12T08:42:06","guid":{"rendered":"https:\/\/sacepe-quest.neel.cnrs.fr\/?page_id=60"},"modified":"2019-09-08T20:29:09","modified_gmt":"2019-09-08T18:29:09","slug":"topological-insulators","status":"publish","type":"page","link":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/topological-insulators\/","title":{"rendered":"Topological Insulators"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-411 alignleft\" src=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/TI-drawing-280x300.png\" alt=\"ti-drawing\" width=\"245\" height=\"263\" srcset=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/TI-drawing-280x300.png 280w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/TI-drawing.png 566w\" sizes=\"auto, (max-width: 245px) 100vw, 245px\" \/>Recently, the coupling between topological insulators (TI&#8217;s) and superconductivity has sparked a wide research interest, due to the prospect of measuring and controlling Majorana Andreev bound states. Owing to the large spin-orbit interaction that modifies the band structure topology, TI&#8217;s exhibit an insulating bulk state and gapless metallic surface states with linear dispersion as for massless Dirac fermions. The properties of these surfaces states are unusual: The spin is locked to the momentum, providing protection against back-scattering (i.e. localization). Furthermore, when the surface state is coupled to superconductivity, the spin-momentum locking yields an unconventional p-wave superconductivity, which carries zero-energy Majorana states.<\/p>\n<p>In our group we grow a variety of high quality TI crystals (e.g. Bi2Se3, Bi2Se2Te, BiSbTeSe2, and superconducting CuxBi2Se3), and prepare exfoliated nano-devices for investigating the coupling between superconducting electrodes and topological surface states. We are currently focusing our research effort on the quantum transport properties such topological Josephson junctions.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-23 alignright\" src=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/LC099_06-10_21_modif-300x239.png\" alt=\"lc099_06-10_21_modif\" width=\"254\" height=\"202\" srcset=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/LC099_06-10_21_modif-300x239.png 300w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/LC099_06-10_21_modif-768x612.png 768w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/LC099_06-10_21_modif-1024x816.png 1024w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2016\/09\/LC099_06-10_21_modif.png 1430w\" sizes=\"auto, (max-width: 254px) 100vw, 254px\" \/><\/p>\n<p><strong>Publications:<\/strong><\/p>\n<ul>\n<li>L. Veyrat et al. <em>Helical quantum Hall phase in graphene on SrTiO3,<\/em><a href=\"https:\/\/arxiv.org\/abs\/1907.02299\"> <strong><em>Arxiv:1907.02299 <\/em><\/strong><\/a>(2019)<\/li>\n<li>K. Le Calvez, et al. <em>Joule overheating poisons the fractional ac Josephson effect in topological Josephson junctions,<\/em> <a href=\"https:\/\/rdcu.be\/bfLit\" target=\"_blank\" rel=\"noopener\"><strong>Communications Physics<\/strong>, 2:4 (2019)<\/a><\/li>\n<li>B. Sac\u00e9p\u00e9, et al. <em>Gate-tuned normal and superconducting transport at the surface of a topological insulator<\/em><em>,<\/em> <a href=\"http:\/\/www.nature.com\/ncomms\/journal\/v2\/n12\/abs\/ncomms1586.html\"><strong>Nature Communications <\/strong>2:575 (2011)<\/a><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><strong>Collaborations:<\/strong> Philippe Plaindoux (I. N\u00e9el), Fr\u00e9d\u00e9ric Gay (I. N\u00e9el), Herv\u00e9 Courtois (I. N\u00e9el), Clemens Winkelmann (I. N\u00e9el), Claude Chapelier (CEA \/ INAC), Manuel Houzet (CEA \/ INAC), Julia Meyer (CEA \/ INAC \/ UGA)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Investigation of topological Josephson junctions.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-60","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/pages\/60","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/comments?post=60"}],"version-history":[{"count":31,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/pages\/60\/revisions"}],"predecessor-version":[{"id":767,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/pages\/60\/revisions\/767"}],"wp:attachment":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/media?parent=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}