{"id":43771,"date":"2021-01-21T11:07:53","date_gmt":"2021-01-21T09:07:53","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=43771"},"modified":"2021-06-14T10:34:36","modified_gmt":"2021-06-14T08:34:36","slug":"43771","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/breves\/43771.html","title":{"rendered":"III-V semiconductor quantum well with honeycomb structuring for the production of quantum materials"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_one_full  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_52_pqzh0u5xkyai\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/11\/sliders_groupe_physique-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;background-position:0% 0%;background-repeat:no-repeat;mix-blend-mode:normal;top:231px;left:0px;height:30px;width:350px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-user-circle\" style=\"color:#f2f2f2;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>GROUPE DE RECHERCHE : PHYSIQUE<\/ls-layer><\/div><div class=\"ls-slide\" data-ls=\"duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/12\/sliders_groupe_physique2-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;background-position:0% 0%;background-repeat:no-repeat;mix-blend-mode:normal;top:231px;left:0px;height:30px;width:350px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-user-circle\" style=\"color:#f2f2f2;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>GROUPE DE RECHERCHE : PHYSIQUE<\/ls-layer><\/div><\/div><\/div><div id='after_layer_slider_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-43771'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ih6dwm-d040680b9001186d814d2fff8ec5bb58\">\n@keyframes av_boxShadowEffect_av-ih6dwm-d040680b9001186d814d2fff8ec5bb58-column {\n0%   { box-shadow:  0 0 0 0 #6b545a; opacity: 1; }\n100% { box-shadow:  0 0 10px 0 #6b545a; opacity: 1; }\n}\n.flex_column.av-ih6dwm-d040680b9001186d814d2fff8ec5bb58{\nbox-shadow: 0 0 10px 0 #6b545a;\nborder-radius:5px 5px 5px 5px;\npadding:5px 5px 5px 5px;\nbackground-color:#8c2020;\n}\n<\/style>\n<div  class='flex_column av-ih6dwm-d040680b9001186d814d2fff8ec5bb58 av_one_full  avia-builder-el-1  el_after_av_layerslider  el_before_av_one_full  avia-builder-el-first  first flex_column_div shadow-not-animated  '     ><section  class='av_textblock_section av-kfqs577w-b7c3550467f47dce013a812928e5cad4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h3 style=\"text-align: center;\"><span style=\"color: #ffffff;\"><br \/>\nPuits quantique semiconducteur III-V \u00e0 structuration alv\u00e9olaire pour l\u2019\u00e9laboration de mat\u00e9riaux quantiques.<\/span><\/h3>\n<h3 style=\"text-align: center;\"><\/h3>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-ikoudi-ce719c7151c34a2a581a30a09f49589c\">\n.flex_column.av-ikoudi-ce719c7151c34a2a581a30a09f49589c{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-ikoudi-ce719c7151c34a2a581a30a09f49589c av_one_full  avia-builder-el-3  el_after_av_one_full  el_before_av_one_third  first flex_column_div av-zero-column-padding  column-top-margin'     ><section  class='av_textblock_section av-kfqrakvy-93df2165636767a713382d76673ffecb '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-43776 size-full\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1.jpg\" alt=\"\" width=\"794\" height=\"318\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1.jpg 794w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1-300x120.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1-768x308.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1-16x6.jpg 16w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_1-705x282.jpg 705w\" sizes=\"auto, (max-width: 794px) 100vw, 794px\" \/><\/a><\/p>\n<blockquote>\n<p>Cette derni\u00e8re d\u00e9cennie a vu la d\u00e9couverte de nombreux mat\u00e9riaux aux propri\u00e9t\u00e9s \u00e9lectroniques extraordinaires traduisant des effets quantiques originaux induits par leur dimensionnalit\u00e9 et leur topologie. A l\u2019instar des effets physiques rencontr\u00e9s dans le graph\u00e8ne, peut-on induire ces propri\u00e9t\u00e9s dans des mat\u00e9riaux semiconducteurs, constituants principaux de l\u2019industrie micro\u00e9lectronique\u00a0? C\u2019est ce que viennent de montrer des chercheurs de l\u2019IEMN, en collaboration avec des coll\u00e8gues d\u2019Utrecht, Shanghai, Bordeaux et Paris-Saclay, gr\u00e2ce \u00e0 des approches nano-technologiques innovantes sur semiconducteurs III-V.<\/p>\n<\/blockquote>\n<p>Lorsqu\u2019un cristal est r\u00e9duit \u00e0 deux dimensions, les \u00e9lectrons ont des propri\u00e9t\u00e9s quantiques totalement inusuelles et contre-intuitives. Dans certains mat\u00e9riaux comme le graph\u00e8ne, les \u00e9lectrons peuvent se comporter comme des particules relativistes sans masse, un peu comme les photons. A l\u2019oppos\u00e9, dans d\u2019autres mat\u00e9riaux, les \u00e9lectrons peuvent \u00eatre plac\u00e9s dans des bandes \u00e9lectroniques totalement plates, leur procurant une masse infinie. Ces syst\u00e8mes \u00e9lectroniques \u00e0 bandes plates suscitent actuellement un int\u00e9r\u00eat consid\u00e9rable de la part des physiciens. En effet, les \u00e9lectrons ayant une \u00e9nergie cin\u00e9tique nulle, des phases quantiques tr\u00e8s originales peuvent se former, par exemple des phases superfluides.<\/p>\n<p>Peut-on induire ces effets dans des mat\u00e9riaux artificiels, dont les propri\u00e9t\u00e9s r\u00e9sulteraient de leur fabrication et donc d\u2019une ing\u00e9nierie des bandes \u00e9lectroniques\u00a0? C\u2019est sur cette question que se sont pench\u00e9s des chercheurs de l\u2019IEMN et du Debye Institute \u00e0 Utrecht. La piste explor\u00e9e est de partir d\u2019un milieu dans lequel les \u00e9lectrons sont originellement parfaitement libres de se d\u00e9placer suivant deux dimensions. Gr\u00e2ce \u00e0 l\u2019application d\u2019un potentiel p\u00e9riodique, les ondes \u00e9lectroniques sont diffus\u00e9es par le potentiel, induisant les dispersions de bandes recherch\u00e9es sous l\u2019effet d\u2019interf\u00e9rences quantiques. Cette approche requiert de structurer le gaz d\u2019\u00e9lectrons libres avec une p\u00e9riodicit\u00e9 proche de la longueur d\u2019onde \u00e9lectronique, de quelques nanom\u00e8tres \u00e0 quelques dizaines de nanom\u00e8tre en fonction des mat\u00e9riaux choisis. Elle a \u00e9t\u00e9 r\u00e9cemment valid\u00e9e \u00e0 Utrecht, en collaboration avec l\u2019IEMN, dans le cas d\u2019\u00e9lectrons localis\u00e9s sur une surface de cuivre soumis \u00e0 un r\u00e9seau p\u00e9riodique de mol\u00e9cules de CO d\u00e9plac\u00e9es au moyen d\u2019une pointe \u00e0 effet tunnel [1].<\/p>\n<p>Induire ces m\u00eames effets dans un semiconducteur conventionnel, tel que ceux utilis\u00e9s par l\u2019industrie micro\u00e9lectronique, ouvrirait \u00e9videmment des perspectives fascinantes pour disposer de plateformes quantiques int\u00e9grables et compatibles avec les technologies micro\u00e9lectroniques. Une premi\u00e8re \u00e9tape vers cet objectif vient d\u2019\u00eatre franchie et publi\u00e9e dans la revue Nano Letters [2]. Un r\u00e9seau en nids d\u2019abeilles a \u00e9t\u00e9 fabriqu\u00e9 dans un puits quantique d\u2019InGaAs \u00e0 l\u2019aide d\u2019une technique de nanostructuration originale d\u00e9velopp\u00e9e au LCPO \u00e0 Bordeaux, la lithographie \u00e0 copolym\u00e8res \u00e0 blocs qui permet d\u2019atteindre des param\u00e8tres de r\u00e9seau de l\u2019ordre de 21 nm. Des mesures de spectroscopie \u00e0 effet tunnel r\u00e9alis\u00e9es \u00e0 l\u2019IEMN et \u00e0 Utrecht d\u00e9montrent une profonde modification de la structure de bandes \u00e9lectroniques, comme cela avait \u00e9t\u00e9 pr\u00e9dit. En particulier, malgr\u00e9 les effets de d\u00e9sordre inh\u00e9rents \u00e0 la nano-lithographie, les spectres poss\u00e8dent les caract\u00e9ristiques attendues par la formation de bandes plates pr\u00e9sentant une tr\u00e8s forte densit\u00e9 d\u2019\u00e9tats \u00e9lectroniques. Cette prouesse, qui a n\u00e9cessit\u00e9 de repousser les limites des techniques de lithographie actuelles, ouvre la voie \u00e0 la g\u00e9n\u00e9ration de phases quantiques non triviales dans les mat\u00e9riaux semiconducteurs les plus r\u00e9pandus.<\/p>\n<p><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-43782\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2-300x201.jpg\" alt=\"\" width=\"328\" height=\"220\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2-300x201.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2-768x516.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2-16x12.jpg 16w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2-705x473.jpg 705w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2021\/01\/visuel_2.jpg 800w\" sizes=\"auto, (max-width: 328px) 100vw, 328px\" \/><\/a>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-925aad50f22a2afd6226a98946929556\">\n.av_font_icon.av-13ewzjw-925aad50f22a2afd6226a98946929556{\ncolor:#800000;\nborder-color:#800000;\n}\n.av_font_icon.av-13ewzjw-925aad50f22a2afd6226a98946929556 .av-icon-char{\nfont-size:40px;\nline-height:40px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-925aad50f22a2afd6226a98946929556 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue803' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/p>\n<h5><span style=\"color: #800000;\">En savoir plus<\/span><\/h5>\n<p><em>[1] p Orbital Flat Band and Dirac Cone in the Electronic Honeycomb Lattice<\/em><br \/>\n<em>T.S. Gardenier, J.J. van den Broeke, J.R. Moes, I. Swart, C. Delerue, M.R. Slot, C. Morais Smith, and D. Vanmaekelbergh. ACS Nano 14 (10), 13638-13644 (2020).<\/em><br \/>\n<a href=\"https:\/\/dx.doi.org\/10.1021\/acsnano.0c05747\">https:\/\/dx.doi.org\/10.1021\/acsnano.0c05747<\/a><\/p>\n<p><em>[2] Engineering a Robust Flat Band in III\u2013V Semiconductor Heterostructures<\/em><br \/>\n<em>N.A. Franchina Vergel, L. Christiaan Post, D. Sciacca, M. Berthe, F. Vaurette, Y. Lambert, D. Yarekha, D. Troadec, C. Coinon, G. Fleury, G. Patriarche, T. Xu, L. Desplanque, X. Wallart, D. Vanmaekelbergh, C. Delerue, and B. Grandidier. Nano Letters\u00a0 21 (1), 680-685 (2021).<\/em><br \/>\n<a href=\"https:\/\/dx.doi.org\/10.1021\/acs.nanolett.0c04268\">https:\/\/dx.doi.org\/10.1021\/acs.nanolett.0c04268<\/a><\/p>\n<p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-d7fc5bb5f69d7332ca6789112e6409b7\">\n.av_font_icon.av-13ewzjw-d7fc5bb5f69d7332ca6789112e6409b7{\ncolor:#800000;\nborder-color:#800000;\n}\n.av_font_icon.av-13ewzjw-d7fc5bb5f69d7332ca6789112e6409b7 .av-icon-char{\nfont-size:20px;\nline-height:20px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-d7fc5bb5f69d7332ca6789112e6409b7 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue89a' data-av_iconfont='entypo-fontello' ><\/span><\/span>supports ANR : ANR-16-CE24-0007-01 et ANR-17-CE09-0021-03<\/p>\n<\/div><\/section><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" 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>christophe.delerue@iemn.fr<\/span><\/a><\/div>\n<\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":46047,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[30],"tags":[],"class_list":["post-43771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-breves"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/43771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=43771"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/43771\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/46047"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=43771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=43771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=43771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}