{"id":76670,"date":"2025-12-22T12:15:18","date_gmt":"2025-12-22T10:15:18","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=76670"},"modified":"2025-12-22T12:15:18","modified_gmt":"2025-12-22T10:15:18","slug":"jon-canosa-these","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/a-la-une\/jon-canosa-these.html","title":{"rendered":"Jon Canosa  18\/12\/2025 &#8211; \u00ab\u00a0Nanophononique quantique \u00e0 basse temp\u00e9rature: vers une manipulation de la chaleur \u00e0 l&rsquo;\u00e9chelle nanom\u00e9trique\u00a0\u00bb"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_heading  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_58_7ivodbyqk98c\" 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\/2019\/01\/sliders_news1.jpg\" class=\"ls-bg\" alt=\"\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2019\/01\/sliders_news1-705x73.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;border-style:solid;border-color:#000;background-position:0% 0%;background-repeat:no-repeat;width:180px;height:30px;left:0px;top:231px;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-quote-right\" style=\"color:#ffffff;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>ACTUALITES<\/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-76670'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67\">\n#top .av-special-heading.av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67{\nmargin:0 0 10px 0;\npadding-bottom:4px;\ncolor:#e58302;\n}\nbody .av-special-heading.av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67 .special-heading-inner-border{\nborder-color:#e58302;\n}\n.av-special-heading.av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-mih9a83v-ee97a9f29780d22e06e1ccb530199c67 av-special-heading-h2 custom-color-heading  avia-builder-el-1  el_after_av_layerslider  el_before_av_hr  avia-builder-el-first  av-linked-heading'><h2 class='av-special-heading-tag'  itemprop=\"headline\"  >Jon Canosa 18\/12\/2025 &#8211; \u00ab\u00a0Nanophononique quantique \u00e0 basse temp\u00e9rature: vers une manipulation de la chaleur \u00e0 l\u2019\u00e9chelle nanom\u00e9trique\u00a0\u00bb<\/h2><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-18u73nj-dad6a947580930e400fc42ba200e80f1\">\n#top .hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1{\nmargin-top:5px;\nmargin-bottom:5px;\n}\n.hr.av-18u73nj-dad6a947580930e400fc42ba200e80f1 .hr-inner{\nwidth:100%;\n}\n<\/style>\n<div  class='hr av-18u73nj-dad6a947580930e400fc42ba200e80f1 hr-custom  avia-builder-el-2  el_after_av_heading  el_before_av_textblock  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-thin'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-jriy64i8-fd5f2e9d63bf552d6910d12f255eb26e'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" >\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a\">\n.av_font_icon.av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a{\ncolor:#e58302;\nborder-color:#e58302;\n}\n.av_font_icon.av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a .av-icon-char{\nfont-size:60px;\nline-height:60px;\n}\n<\/style>\n<span  class='av_font_icon av-13ewzjw-649e41ac67c26b53aa0b3d91d18e5f5a 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='\ue8c9' data-av_iconfont='entypo-fontello' ><\/span><\/span>\n<h4>Jon Canosa<\/h4>\n<p><strong>Le 18 d\u00e9cembre 2025 \u00e0 14h00<br \/>\n<\/strong>Amphith\u00e9\u00e2tre LCI<\/p>\n<\/div><\/section>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-jtefqx33-e91575393b713d2b7f933b9ae63e865f\">\n#top .av_textblock_section.av-jtefqx33-e91575393b713d2b7f933b9ae63e865f .avia_textblock{\nfont-size:13px;\n}\n<\/style>\n<section  class='av_textblock_section av-jtefqx33-e91575393b713d2b7f933b9ae63e865f'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><div  class='hr av-kjh3zw-4dff888f744b728a1aca9b3a0971493a hr-default  avia-builder-el-6  avia-builder-el-no-sibling'><span class='hr-inner'><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<h5><strong><span style=\"color: #800000;\">Jury :<\/span><\/strong><\/h5>\n<ul>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b>M. Ilari MAALSITA,\u00a0<b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"><i style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">University Professor<\/i><\/b>\u00a0<\/b><i>,\u00a0<i style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Jyvaskyla<\/i>,<\/i><b>\u00a0Rapporteur<\/b><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b>Mme Florence RAZAN,\u00a0<b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"><i style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Professeure des universit\u00e9s<\/i><\/b>\u00a0<\/b><i>,\u00a0<i style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">ENS Rennes<\/i>,\u00a0<\/i><b>Rapporteure<\/b><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b><b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Mme<\/b>\u00a0S\u00e9verine Gomes<\/b><i>, Directrice de Recherche, CETHIL,\u00a0<b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Examinatrice<\/b><\/i><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b>Mme\u00a0<b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Xin ZOU<\/b><i style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">,\u00a0Charg\u00e9e de recherche,\u00a0IEMN,<\/i><\/b><i>,<\/i><b>\u00a0Examinatrice<\/b><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b>M. Jean-Fran\u00e7ois ROBILLARD,\u00a0<\/b><i>Enseignant-Chercheur, Junia, Lille,\u00a0<\/i><b>Directeur de th\u00e8se<\/b><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 0cm 36pt;\"><b>M. Emmanuel DUBOIS,\u00a0<\/b><i>Directeur de recherche CNRS, ISEN-IEMN, Lille, <b style=\"color: #000000; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\">Invit\u00e9<\/b><\/i><\/li>\n<li style=\"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000; line-height: 17.12px; margin: 0cm 0cm 8pt 36pt;\"><b>M. Olivier BOURGEOIS,<\/b><em>Directeur de Recherche CNRS, Institut N\u00e9el<\/em>\u00a0<i>, Grenoble,<\/i><b>\u00a0Invit\u00e9<\/b><\/li>\n<\/ul>\n<h5><span style=\"color: #800000;\">Summary:<\/span><\/h5>\n<div class=\"elementToProof\"><span style=\"font-family: 'Trebuchet MS Bold', Verdana, Arial; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: justify; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;\">Le transport thermique \u00e0 l&rsquo;\u00e9chelle nanom\u00e9trique fait depuis longtemps l&rsquo;objet de recherches, en raison de son importance tant en physique fondamentale que dans les applications pratiques. D&rsquo;une part, il existe encore un important d\u00e9ficit de connaissances dans ce domaine, en particulier dans les syst\u00e8mes nanom\u00e9triques \u00e0 tr\u00e8s basse temp\u00e9rature (jusqu&rsquo;\u00e0 1 K ou moins). Dans ces conditions, le libre parcours moyen (\u039b) et la longueur d&rsquo;onde dominante (\u03bb_DOM) des phonons deviennent comparables ou sup\u00e9rieurs \u00e0 la taille de l&rsquo;\u00e9chantillon, ce qui permet d&rsquo;acc\u00e9der aux r\u00e9gimes de transport balistique et coh\u00e9rent des phonons. D&rsquo;autre part, la miniaturisation des dispositifs \u00e9lectroniques et les nouvelles tendances en mati\u00e8re de circuits int\u00e9gr\u00e9s \u00e0 l&rsquo;\u00e9chelle nanom\u00e9trique ont introduit des d\u00e9fis importants en mati\u00e8re de gestion thermique. Cela devient de plus en plus important pour les applications dans les ordinateurs quantiques ou le d\u00e9veloppement des technologies cryo-CMOS. Le projet Hanibal a pour objectif d&rsquo;approfondir les connaissances sur les diff\u00e9rents r\u00e9gimes de transport thermique et d&rsquo;\u00e9tudier certains ph\u00e9nom\u00e8nes int\u00e9ressants observ\u00e9s dans ce domaine, tels que la rectification thermique, la r\u00e9duction de la conductance thermique dans les syst\u00e8mes \u00e0 cristaux phononiques et la quantification du transport thermique. \u00catre capable de d\u00e9montrer ces m\u00e9canismes de transport thermique contre-intuitifs signifie convertir de minuscules quantit\u00e9s d&rsquo;\u00e9nergie en une quantit\u00e9 mesurable. Pour atteindre ces objectifs, des dispositifs thermiques suspendus \u00e0 base de silicium ont \u00e9t\u00e9 fabriqu\u00e9s. Ces dispositifs sont produits \u00e0 partir de plaquettes de silicium sur isolant (SOI) \u00e0 l&rsquo;aide de techniques de micro\/nanofabrication, principalement la lithographie par faisceau \u00e9lectronique et la gravure \u00e0 sec (RIE, ICP-RIE). Des fils supraconducteurs en NbTi garantissent l&rsquo;absence de chauffage parasite pendant le contr\u00f4le du dispositif, tandis que la d\u00e9tection est assur\u00e9e par de fines couches de NbN, atteignant des sensibilit\u00e9s de l&rsquo;ordre du femtowatt (10\u207b15 W). Divers \u00e9chantillons (nanofils et membranes \u00e0 motifs 2D) ont \u00e9t\u00e9 fabriqu\u00e9s pour les \u00e9tudes pr\u00e9vues. Ce travail est men\u00e9 en collaboration avec le CEA-LITEN (pour les simulations th\u00e9oriques) et l&rsquo;Institut N\u00e9el (pour la fabrication des \u00e9chantillons et les mesures par r\u00e9frig\u00e9rateur \u00e0 dilution). \u00c0 l&rsquo;Institut N\u00e9el, des \u00e9chantillons \u00e0 base de SiN ont \u00e9galement \u00e9t\u00e9 produits afin de comparer le comportement du SixNy amorphe \u00e0 celui du Si cristallin. Contrairement \u00e0 ces attentes, les membranes asym\u00e9triques \u00e0 motifs phononiques \u00e0 base de SiN pr\u00e9sentent un taux de rectification reproductible d&rsquo;environ 20 % en dessous de 4 K, d\u00e9montrant un transport de chaleur directionnel avec une application potentielle.<\/span>Les r\u00e9sultats pour nos \u00e9chantillons \u00e0 base de silicium seront pr\u00e9sent\u00e9s. En r\u00e9sum\u00e9, la haute sensibilit\u00e9 de ces dispositifs de thermom\u00e9trie et leur capacit\u00e9 \u00e0 accueillir plusieurs types d&rsquo;\u00e9chantillons entre les r\u00e9servoirs permettront de faire progresser les capacit\u00e9s exp\u00e9rimentales en mati\u00e8re de mesures de transport thermique \u00e0 basse temp\u00e9rature. Dans cette soutenance de th\u00e8se, nous discuterons des principaux d\u00e9fis scientifiques et technologiques du projet, mettrons en avant les dispositifs enti\u00e8rement finis et la m\u00e9thode de mesure. Les premi\u00e8res donn\u00e9es de rectification thermique seront pr\u00e9sent\u00e9es. Enfin, nous esquisserons les perspectives d&rsquo;avenir pour la caract\u00e9risation des \u00e9chantillons et les pistes de recherche.<\/div>\n<p><strong><span style=\"color: #800000;\">Abstract:<\/span><\/strong><\/p>\n<div class=\"elementToProof\">\n<div>\n<p style=\"margin: 0px;\">Thermal transport at the nanoscale has long been the subject of research, due to its importance in both fundamental physics and practical applications. On the one hand, there is still a significant knowledge gap in this field, particularly in nanoscale systems at very low temperatures (down to 1 K or less). Under these conditions, the mean free path (\u039b) and dominant wavelength (\u03bb_DOM) of phonons become comparable to or larger than the sample size, allowing access to ballistic and coherent phonon transport regimes. On the other hand, the miniaturization of electronic devices and new trends in nanoscale integrated circuits have introduced significant challenges in thermal management. This is becoming increasingly important for applications in quantum computers or the development of cryo-CMOS technologies. The Hanibal project aims to deepen knowledge of the different thermal transport regimes and study some interesting phenomena observed in this field, such as thermal rectification, thermal conductance reduction in phononic crystal systems, and thermal transport quantization.<\/p>\n<p style=\"margin: 0px;\">Being able to demonstrate these counterintuitive heat transfer mechanisms means converting tiny amounts of energy into a measurable quantity. To achieve these goals, silicon-based suspended thermal devices have been fabricated. These devices are produced from silicon-on-insulator (SOI) wafers using micro\/nanofabrication techniques, primarily electron beam lithography and dry etching (RIE, ICP-RIE). NbTi superconducting wires ensure that there is no parasitic heating during device control, while detection is provided by thin layers of NbN, achieving sensitivities in the femtowatt range (10\u207b\u00b9\u2075 W). Various samples (nanowires and 2D patterned membranes) have been fabricated for the planned studies. This work is being carried out in collaboration with CEA-LITEN (for theoretical simulations) and the N\u00e9el Institute (for sample fabrication and dilution refrigerator measurements). At the Institut N\u00e9el, SiN-based samples were also produced in order to compare the behavior of amorphous SixNy with that of crystalline Si. Contrary to expectations, asymmetric phononic-patterned membranes based on SiN exhibit a reproducible rectification rate of approximately 20% below 4 K, demonstrating directional heat transport with potential applications.<\/p>\n<p style=\"margin: 0px;\">The results for our silicon-based samples will be shown. In summary, the high sensitivity of these thermometry devices and their ability to accommodate multiple sample types between reservoirs will advance experimental capabilities in low-temperature heat transport measurements. In this thesis defense, we will discuss the main scientific and technological challenges of the project, highlight the fully finished devices and the measurement method. The first thermal rectification data will be presented. Finally, we will outline the future prospects for sample characterization and avenues for research.<\/p>\n<\/div>\n<\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":71083,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,8,199],"tags":[],"class_list":["post-76670","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une","category-actualites","category-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76670","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\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=76670"}],"version-history":[{"count":6,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76670\/revisions"}],"predecessor-version":[{"id":76676,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/76670\/revisions\/76676"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/71083"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=76670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=76670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=76670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}