{"id":574,"date":"2018-07-10T12:04:21","date_gmt":"2018-07-10T10:04:21","guid":{"rendered":"https:\/\/sacepe-quest.neel.cnrs.fr\/?p=574"},"modified":"2018-07-10T12:05:36","modified_gmt":"2018-07-10T10:05:36","slug":"nature-physics-paper-on-moge-nanowire-is-online","status":"publish","type":"post","link":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/2018\/07\/10\/nature-physics-paper-on-moge-nanowire-is-online\/","title":{"rendered":"Nature Physics paper on MoGe nanowire is online !"},"content":{"rendered":"<h2 class=\"tighten-line-height small-space-below\" data-test=\"article-title\"><a href=\"https:\/\/www.nature.com\/articles\/s41567-018-0179-8\">Pair-breaking quantum phase transition in superconducting nanowires<\/a><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-575 alignright\" src=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2018\/07\/pairbreaking_v4-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2018\/07\/pairbreaking_v4-300x225.jpg 300w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2018\/07\/pairbreaking_v4-768x576.jpg 768w, https:\/\/sacepe-quest.neel.cnrs.fr\/wp-content\/uploads\/2018\/07\/pairbreaking_v4-1024x768.jpg 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Quantum phase transitions (QPT) between distinct ground states of matter are widespread phenomena, yet there are only a few experimentally accessible systems where the microscopic mechanism of the transition can be tested and understood. These cases are unique and form the experimentally established foundation for our understanding of quantum critical phenomena. Here we report that a magnetic-field-driven QPT in superconducting nanowires\u2014a prototypical one-dimensional system (<i>d<\/i>=1)\u2014can be fully explained by the critical theory of pair-breaking transitions characterized by a correlation length exponent <i>v<\/i>\u22481 and dynamic critical exponent <i>z<\/i>\u22482. We find that in the quantum critical regime, the electrical conductivity is in agreement with a theoretically predicted scaling function and, moreover, that the theory quantitatively describes the dependence of conductivity on the critical temperature, field magnitude and orientation, nanowire cross-sectional area, and microscopic parameters of the nanowire material. At the critical field, the conductivity follows a <i>T<\/i><sup>(<i>d<\/i>\u20132)\/<i>z<\/i><\/sup> dependence predicted by phenomenological scaling theories and more recently obtained within a holographic framework. Our work uncovers the microscopic processes governing the transition: the pair-breaking effect of the magnetic field on interacting Cooper pairs overdamped by their coupling to electronic degrees of freedom. It also reveals the universal character of continuous quantum phase transitions.<\/p>\n<p class=\"text14 standard-space-below\">Hyunjeong Kim, Fr\u00e9d\u00e9ric Gay, Adrian Del Maestro, Benjamin Sac\u00e9p\u00e9, Andrey Rogachev. <a href=\"https:\/\/www.nature.com\/articles\/s41567-018-0179-8\"><i data-test=\"journal-title\">Nature Physics<\/i> (<span data-test=\"article-publication-year\">2018)<\/span><\/a><\/p>\n<p><a href=\"https:\/\/unews.utah.edu\/nanomaterial-loses-superconductivity\/\">Press Release<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pair-breaking quantum phase transition in superconducting nanowires Quantum phase transitions (QPT) between distinct ground states of matter are widespread phenomena, yet there are only a few experimentally accessible systems where the microscopic mechanism of the transition can be tested and<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-574","post","type-post","status-publish","format-standard","hentry","category-non-classe"],"_links":{"self":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/posts\/574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"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=574"}],"version-history":[{"count":3,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/posts\/574\/revisions"}],"predecessor-version":[{"id":578,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/posts\/574\/revisions\/578"}],"wp:attachment":[{"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/media?parent=574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/categories?post=574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sacepe-quest.neel.cnrs.fr\/index.php\/wp-json\/wp\/v2\/tags?post=574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}