{"id":13676,"date":"2017-09-29T11:47:31","date_gmt":"2017-09-29T09:47:31","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=13676"},"modified":"2019-09-06T10:44:00","modified_gmt":"2019-09-06T08:44:00","slug":"seminaire-autour-de-la-manipulation-de-spin-dans-les-nanostructures-de-semiconducteurs","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/actualites\/seminaire-autour-de-la-manipulation-de-spin-dans-les-nanostructures-de-semiconducteurs.html","title":{"rendered":"S\u00e9minaire autour de la manipulation de spin dans les nanostructures de semiconducteurs"},"content":{"rendered":"<h4><strong>Physics of electron g-factors in semiconductor nanostructures<\/strong><\/h4>\n<blockquote><p><span style=\"color: #000000;\">Athmane Tadjine (doctorant dans le groupe physique)<\/span><br \/>\n<span style=\"color: #000000;\">Salle du conseil, mardi 16 novembre 2017, 14h00.<\/span><\/p><\/blockquote>\n<p><div id=\"attachment_13683\" style=\"width: 264px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2017\/09\/medium.png\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-13683\" class=\"wp-image-13683\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2017\/09\/medium.png\" alt=\"\" width=\"254\" height=\"258\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2017\/09\/medium-80x80.png 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2017\/09\/medium-36x36.png 36w\" sizes=\"auto, (max-width: 254px) 100vw, 254px\" \/><\/a><p id=\"caption-attachment-13683\" class=\"wp-caption-text\">Normalized density of g0\u2212gz on each atom of a spherical nanocrystal of CdSe (diameter = 9 nm) for a magnetic field along z. The density is shown in the xOy (a) and xOz (b) planes passing through the center of the sphere. These data can be seen as the intensity of the local orbital component \u03bcl(r) of the magnetic moment (red arrow) induced by the circulating current [depicted by the circular arrow in (a)] generated by the spin-orbit coupling. The atoms are represented by black dots. (c) and (d) are same as (a) and (b), respectively, but calculated using the analytic envelope wave function<\/p><\/div><span style=\"color: #000000;\">The manipulation of the electron spin in semiconductor nanostructures requires the knowledge of the electron g-factor. In this work, we revisit the physics of the electron g-factor in nanostructures of various shape, size, dimensionality (0D-3D) and composition. Our investigation is based on a combination of atomistic and analytical calculations. <\/span><\/p>\n<p><span style=\"color: #000000;\">We show that, for a given compound, the electron g-factors follow a universal law that just depends on the energy gap, in particular along rotational symmetry axes. We demonstrate that the orbital magnetic moment density strongly depends on the shape of the nanostructure but the total (integrated) magnetic moment is independent of the shape and therefore of the electron envelope wavefunction. The physical origin of this non-trivial behavior is explained.<br \/>\nWe deduce that the bulk component of the g-factor is isotropic and that g-factor anisotropies entirely come from surface effects.<\/span><\/p>\n<p>Athmane Tadjine (1), Yann-Michel Niquet (2), and Christophe Delerue (1)<\/p>\n<p><em>1 Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Valenciennes, UMR 8520-IEMN,F-59000 Lille, nFrance<\/em><br \/>\n<em> 2 Universit\u00e9 Grenoble Alpes, INAC-MEM, L Sim, Grenoble, France and CEA, INAC-MEM, L Sim, 38000 Grenoble, France<\/em><\/p>\n<p>Reference: A. Tadjine, Y.-M. Niquet, and C. Delerue, Phys. Rev. B 95, 235437 (2017).<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Physics of electron g-factors in semiconductor nanostructures Athmane Tadjine (PhD student in the physics group) Boardroom, Tuesday 16 November 2017, 14:00. The manipulation of the electron spin in semiconductor nanostructures requires the knowledge of the electron g-factor. In this work, we revisit the physics of the electron g-factor in nanostructures of various shape, size, [...]<\/p>","protected":false},"author":2,"featured_media":13786,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-13676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/13676","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=13676"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/13676\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media\/13786"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=13676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=13676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=13676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}