{"id":10904,"date":"2024-08-28T08:56:37","date_gmt":"2024-08-28T06:56:37","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&#038;p=10904"},"modified":"2024-09-02T09:14:24","modified_gmt":"2024-09-02T07:14:24","slug":"tba-lorenzo-stella-lpt-seminar-5-09-2024-14h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/tba-lorenzo-stella-lpt-seminar-5-09-2024-14h\/","title":{"rendered":"Real-time time-dependent density functional theory for nanoplasmonics : Neutral and charged nanowire dimers. &#8211; (Lorenzo Stella \/ LPT \/ Seminar). &#8211; 5\/09\/2024, 14H"},"content":{"rendered":"<p><span style=\"font-size: 20px;\"><span style=\"color: #191970;\"><strong>Lorenzo Stella <\/strong><\/span>(Universit\u00e9 Queen\u2019s de Belfast)<\/span><\/p>\n<p><span style=\"background-color: #cecece;\">Seminar LPT, 5\/09\/2024, 14H, 3R1, seminar room, 3rd floor<\/span><\/p>\n<p><span style=\"color: #191970;\"><strong><span style=\"font-size: 20px;\">Abstract :\u00a0<\/span> <\/strong><\/span><br \/>\nPlasmons are electron density oscillations with respect to the ionic background. Metal and heavily doped semiconductors can support volume, surface and localised plasmon modes. In plasmonic devices, plasmonic modes are used, e.g., for chemical sensing, promoting catalysis and localised heating. Numerical modelling of plasmonic devices is routinely done by solving macroscopic Maxwell equations, given a suitable parametrisation of the material (metal and dielectric) permittivities.<\/p>\n<p>At the nanoscale, numerical models based on macroscopic permittivities are no longer reliable. At this scale, time-dependent density functional theory (TDDFT) within the adiabatic local density approximation (ALDA) already provides a reliable description of the electron density oscillations, including subtle effects due to electron spill-out and tunnelling.<\/p>\n<p>In this talk, I will illustrate the application of TDDFT to nanoplasmonics using a nanowire dimer as a test-case. Well-known results for the plasmon resonance evolution of neutral dimers as a function of the nanowire distance will be compared with more recent results for their charged counterparts. Our real-time TDDFT results suggest that oppositely charged nanowires form a \u00ab\u00a0nanocapacitor\u00a0\u00bb which can \u00ab\u00a0discharge\u00a0\u00bb by means of a charge-transfer current through the gap.<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<div class=\"leaflet-map WPLeafletMap\" style=\"height:300px; width:80%;\"><\/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([43.560705280387,1.4674275538563],16);window.WPLeafletMapPlugin.createScale({});});<\/script>\n<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('Seminar room, 3R1'));window.WPLeafletMapPlugin.markers.push( marker );\n        });<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Lorenzo Stella (Universit\u00e9 Queen\u2019s de Belfast)<\/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":[48,313,233],"class_list":["post-10904","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-events","tribe_events_cat-lpt","tribe_events_cat-seminars","cat_events","cat_lpt","cat_seminars"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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