{"id":11220,"date":"2024-12-12T06:13:35","date_gmt":"2024-12-12T05:13:35","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&#038;p=11220"},"modified":"2024-12-12T11:10:16","modified_gmt":"2024-12-12T10:10:16","slug":"onde-de-densite-dans-un-gaz-de-fermions-phonons-et-plasmons-du-regime-hydrodynamique-au-regime-non-collisionnel-thomas-repplinger-lpt-these-12-12-2024-15h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/onde-de-densite-dans-un-gaz-de-fermions-phonons-et-plasmons-du-regime-hydrodynamique-au-regime-non-collisionnel-thomas-repplinger-lpt-these-12-12-2024-15h\/","title":{"rendered":"Onde de densit\u00e9 dans un gaz de fermions : phonons et plasmons, du r\u00e9gime hydrodynamique au r\u00e9gime non-collisionnel. &#8211; (Thomas Repplinger \/ LPT \/ Th\u00e8se). &#8211; 12\/12\/2024, 15H"},"content":{"rendered":"<p><span style=\"font-size: 20px; background-color: #f18500;\">Soutenance de th\u00e8se<\/span><\/p>\n<p><strong><span style=\"font-size: 20px; color: #191970;\">Thomas Repplinger, <\/span><\/strong>LPT, Salle de conf\u00e9rence, Bat. 3R4<\/p>\n<p><span style=\"font-size: 20px;\"><strong>R\u00e9sum\u00e9:<\/strong><\/span><\/p>\n<p>La th\u00e9orie de Landau des liquides de Fermi est un cadre de travail qui simplifie la description de la dynamique de certains syst\u00e8mes de fermions en s&rsquo;appuyant sur la r\u00e9solution d&rsquo;une \u00e9quation de Boltzmann. Cette th\u00e9orie d\u00e9crit le comportement \u00e0 basse temp\u00e9rature de la plupart des m\u00e9taux, ainsi que de l\u2019h\u00e9lium 3. L\u2019un de ses plus grands succ\u00e8s a \u00e9t\u00e9 la pr\u00e9diction du son z\u00e9ro, un son non-collisionnel, qui a ensuite \u00e9t\u00e9 mesur\u00e9 exp\u00e9rimentalement dans l\u2019h\u00e9lium 3. Malgr\u00e9 de nombreux efforts, un d\u00e9saccord quantitatif persiste entre la th\u00e9orie et les exp\u00e9riences. En cause, l\u2019interaction entre quasiparticules et la probabilit\u00e9 de collisions, lesquelles ne peuvent pas \u00eatre calcul\u00e9es \u00e0 partir d\u2019une th\u00e9orie microscopique.<\/p>\n<p>Avec l\u2019av\u00e8nement des gaz ultrafroids d\u2019atomes fermioniques, nous avons d\u00e9sormais la possibilit\u00e9 de tester quantitativement la th\u00e9orie de Landau, notamment en ce qui concerne les propri\u00e9t\u00e9s de transport. C\u2019est dans ce cadre que s\u2019inscrit ma th\u00e8se. Je commencerai par introduire les principes fondamentaux de cette th\u00e9orie. Nous examinerons ensuite son application aux gaz de fermions homog\u00e8nes, en particulier dans le contexte de l\u2019exp\u00e9rience men\u00e9e par Nir Navon (Yale). Cela nous permettra de calculer exactement leurs propri\u00e9t\u00e9s de transport (viscosit\u00e9 de cisaillement et conductivit\u00e9 thermique) \u00e0 toutes les temp\u00e9ratures, r\u00e9sultats connue mais oubli\u00e9 dans le contexte des atomes froids, ainsi que la dispersion du son hydrodynamique \u00e0 basse temp\u00e9rature. Pour terminer, nous comparerons la r\u00e9ponse lin\u00e9aire calcul\u00e9e dans le cadre des liquides de Fermi avec les mesures effectu\u00e9es \u00e0 Yale.<\/p>\n<hr \/>\n<p class=\"western\"><code class=\"western\"><div class=\"leaflet-map WPLeafletMap\" style=\"height:300px; width:70%;\"><\/div><script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMapShortcode() {\/*<script>*\/\nvar baseUrl = atob('aHR0cHM6Ly97c30udGlsZS5vcGVuc3RyZWV0bWFwLm9yZy97en0ve3h9L3t5fS5wbmc=');\nvar base = (!baseUrl && window.MQ) ?\n    window.MQ.mapLayer() : L.tileLayer(baseUrl,\n        L.Util.extend({}, {\n            detectRetina: 0,\n        },\n        {\"subdomains\":\"abc\",\"noWrap\":false,\"maxZoom\":18}        )\n    );\n    var options = L.Util.extend({}, {\n        layers: [base],\n        attributionControl: false\n    },\n    {\"zoomControl\":true,\"scrollWheelZoom\":true,\"doubleClickZoom\":true,\"fitBounds\":true,\"minZoom\":9,\"maxZoom\":18,\"maxBounds\":null,\"attribution\":\"<a href=\\\"http:\\\/\\\/leafletjs.com\\\" title=\\\"Une biblioth\\u00e8que JS pour des cartes interactives\\\">Leaflet<\\\/a>; \\u00a9 <a href=\\\"http:\\\/\\\/www.openstreetmap.org\\\/copyright\\\">OpenStreetMap<\\\/a> contributeurs\"},\n    {});\nwindow.WPLeafletMapPlugin.createMap(options).setView([43.560830727361,1.4672373725804],16);window.WPLeafletMapPlugin.createScale({});});<\/script><\/code><\/p>\n<p class=\"western\"><code class=\"western\"><script>\nwindow.WPLeafletMapPlugin = window.WPLeafletMapPlugin || [];\nwindow.WPLeafletMapPlugin.push(function WPLeafletMarkerShortcode() {\/*<script>*\/\nvar map = window.WPLeafletMapPlugin.getCurrentMap();\nvar group = window.WPLeafletMapPlugin.getCurrentGroup();\nvar marker_options = window.WPLeafletMapPlugin.getIconOptions({});\nvar marker = L.marker(\n    [0,0],\n    marker_options\n);\nvar is_image = map.is_image_map;\n    marker.setLatLng( map.getCenter() );\nif (marker_options.draggable) {\n    marker.on('dragend', function () {\n        var latlng = this.getLatLng();\n        var lat = latlng.lat;\n        var lng = latlng.lng;\n        if (is_image) {\n            console.log('leaflet-marker y=' + lat + ' x=' + lng);\n        } else {\n            console.log('leaflet-marker lat=' + lat + ' lng=' + lng);\n        }\n    });\n}\nmarker.addTo( group );\nmarker.bindPopup(window.WPLeafletMapPlugin.unescape('&lt;strong class=&quot;&quot;&gt;Salle de conf\u00e9rence &lt;\/strong&gt;(- B\u00e2timent 3R4)'));window.WPLeafletMapPlugin.markers.push( marker );\n        });<\/script><\/code><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lieu : Salle de conf\u00e9rence, Bat. 3R4<\/p>\n","protected":false},"author":5,"featured_media":0,"template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[48,308,313],"class_list":["post-11220","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-events","tribe_events_cat-hdr-thesis","tribe_events_cat-lpt","cat_events","cat_hdr-thesis","cat_lpt"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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