{"id":455,"date":"2011-11-03T20:54:00","date_gmt":"2011-11-03T19:54:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=455"},"modified":"2025-10-28T15:25:23","modified_gmt":"2025-10-28T14:25:23","slug":"benjamin-pasquiou","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/","title":{"rendered":"Effects of dipole-dipole interaction on magnetic properties of a chromium condensate"},"content":{"rendered":"\n<div id=\"wp-block-themeisle-blocks-advanced-columns-09711f80\" class=\"wp-block-themeisle-blocks-advanced-columns has-2-columns has-desktop-twoOne-layout has-tablet-equal-layout has-mobile-collapsedRows-layout has-vertical-unset\"><div class=\"wp-block-themeisle-blocks-advanced-columns-overlay\"><\/div><div class=\"innerblocks-wrap\">\n<div id=\"wp-block-themeisle-blocks-advanced-column-e7183572\" class=\"wp-block-themeisle-blocks-advanced-column\">\n<h4 class=\"wp-block-heading\"><strong>Abstract:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Our team achieved in 2007 the Bose Einstein condensation of <sup>52<\/sup>Cr chromium atoms, which have a strong magnetic moment in their ground state ( 6 \u00b5B, instead of 1 \u00b5B for alkali atoms). The dipole dipole interaction thus induced differs from the van der Waals interactions, usually dominating the physics of a condensate, by its long range character and its anisotropy, and modifies for instance the hydrodynamic properties of this quantum fluid. This thesis is focused on the study and control of collisions with changes in magnetization, induced by dipole dipole interactions within a condensate. We have measured the rate of dipolar inelastic collisions as a function of the magnetic field, from which we deduced accurate values for the chromium scattering lengths a6 = (103+\/-4) aB and a4 = (64 +\/- 4) aB. In optical lattices, these dipolar collisions can be lowered and even suppressed by spatial confinement, and we observed an exchange between spin relaxation and lattice band excitation, which can be made resonant in 3D optical lattices. The suppression of these collisions allows for the creation of a degenerate gas in a metastable state. Finally, we have observed a quantum phase transition at extremely low magnetic field (B about 250 \u00b5Gauss), between a condensate of ferromagnetic nature and a non-polarized multicomponent spinor condensate : the existence of such phases is determined by the differences between spin dependent contact interactions. We have studied the demagnetization dynamics, fixed by dipole-dipole interactions, at this phase transition, and the thermodynamics of such a spinor in the case of a free magnetization.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-995f960e wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-fd1f4557-76d3-4715-b473-9449d0020c6b\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/10\/2011-Thesis-Benjamin-Pasquiou.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">2011 &#8211; Thesis &#8211; Benjamin Pasquiou<\/a><a href=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/10\/2011-Thesis-Benjamin-Pasquiou.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-fd1f4557-76d3-4715-b473-9449d0020c6b\">Download<\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/theses.hal.science\/tel-00659391v1\" data-type=\"link\" data-id=\"https:\/\/theses.hal.science\/tel-00659391v1\" target=\"_blank\" rel=\"noreferrer noopener\">Link to HAL<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<div id=\"wp-block-themeisle-blocks-advanced-column-4bfc9d1b\" class=\"wp-block-themeisle-blocks-advanced-column\">\n<p class=\"wp-block-paragraph\"><em>Soutenance de th\u00e8se de Benjamin Pasquiou<\/em><br><strong>Date:<\/strong> Jeudi 3 novembre 2011 \u00e0 14H00<br><strong>Location:<\/strong> Amphi Euler de l\u2019Institut Galil\u00e9e<br>Laboratoire de Physique des Lasers, 99 av. J.B. Cl\u00e9ment 93430 Villetaneuse France<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Keywords:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Bose Einstein condensation, dipolar interactions, chromium, dipolar relaxation,<br>optical lattices, quantum spinor phases, thermodynamics for magnetism.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Jury:<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Christophe Salomon (President)<\/li>\n\n\n\n<li>Christoph Westbrook (Referee)<\/li>\n\n\n\n<li>Florian Schreck (Referee)<\/li>\n\n\n\n<li>Anne Crubellier (Examiner)<\/li>\n\n\n\n<li>Anne Amy-Klein (Examiner)<\/li>\n\n\n\n<li>Bruno Laburthe-Tolra (Co-supervisor)<\/li>\n\n\n\n<li>Olivier Gorceix (Supervisor)<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">French version:<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">Effets de l\u2019interaction dip\u00f4le-dip\u00f4le<br>sur les propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de chrome<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Notre \u00e9quipe a obtenu en 2007 un condensat de Bose Einstein de chrome <sup>52<\/sup>Cr, \u00e9l\u00e9ment poss\u00e9dant un fort moment magn\u00e9tique dans son \u00e9tat fondamental ( \u00b5 = 6\u00b5B, contre \u00b5= 1 \u00b5B pour les syst\u00e8mes alcalins). L\u2019interaction dip\u00f4le-dip\u00f4le ainsi induite se d\u00e9marque des interactions dominant habituellement la physique d\u2019un condensat, d\u00eetes de van der Waals, par son caract\u00e8re longue port\u00e9e et son anisotropie, et modifie par exemple les propri\u00e9t\u00e9s hydrodynamiques de ce fluide quantique. Le coeur de ce travail de th\u00e8se est ax\u00e9 sur l\u2019\u00e9tude et le contr\u00f4le de collisions avec changement de magn\u00e9tisation dues \u00e0 l\u2019interaction dip\u00f4le-dip\u00f4le au sein d\u2019un condensat. Nous avons mesur\u00e9 le taux de collisions in\u00e9lastiques dipolaires en fonction du champ magn\u00e9tique, ce qui nous a notamment permis de d\u00e9duire des valeurs pr\u00e9cises des longueurs de diffusion a6 = (103 +\/- 4) aB et a4 = (64 +\/- 4) aB du chrome. Dans des r\u00e9seaux optiques, ces m\u00eames collisions peuvent \u00eatre contr\u00f4l\u00e9es voire annul\u00e9es par le confinement, et nous observons un \u00e9change entre relaxation du spin et excitation des bandes vibrationnelles, qui peut \u00eatre effectu\u00e9 de fa\u00e7on r\u00e9sonante (pour des r\u00e9seaux optiques 3D). L\u2019annulation de ces collisions nous permet notamment de cr\u00e9er un gaz d\u00e9g\u00e9n\u00e9r\u00e9 dans un \u00e9tat m\u00e9tastable. Enfin, nous avons observ\u00e9 une transition de phase quantique \u00e0 tr\u00e8s bas champ magn\u00e9tique (B envrion 250 microGauss), entre un condensat de nature ferromagn\u00e9tique et un condensat spinoriel non polaris\u00e9 : l\u2019existence de ces phases est d\u00e9termin\u00e9e par la diff\u00e9rence d\u2019interaction de contact entre les diverses composantes de spin. Nous avons \u00e9tudi\u00e9 la dynamique, fix\u00e9e par l\u2019interaction dipolaire, de la d\u00e9magn\u00e9tisation du condensat lors de cette transition de phase, ainsi que la thermodynamique d\u2019un tel spineur, dans le cas original o\u00f9 la magn\u00e9tisation totale du syst\u00e8me est libre.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>French version: Effets de l\u2019interaction dip\u00f4le-dip\u00f4lesur les propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de chrome Notre \u00e9quipe a obtenu en 2007 un condensat de Bose Einstein de chrome 52Cr, \u00e9l\u00e9ment poss\u00e9dant un fort moment magn\u00e9tique dans son \u00e9tat fondamental ( \u00b5 = 6\u00b5B, contre \u00b5= 1 \u00b5B pour les syst\u00e8mes alcalins). L\u2019interaction dip\u00f4le-dip\u00f4le ainsi induite se d\u00e9marque [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[75],"tags":[28],"class_list":["post-455","post","type-post","status-publish","format-standard","hentry","category-phd-thesis","tag-benjamin-pasquiou"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Effects of dipole-dipole interaction on magnetic properties of a chromium condensate - Magnetic Quantum Gases<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Effects of dipole-dipole interaction on magnetic properties of a chromium condensate - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"French version: Effets de l\u2019interaction dip\u00f4le-dip\u00f4lesur les propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de chrome Notre \u00e9quipe a obtenu en 2007 un condensat de Bose Einstein de chrome 52Cr, \u00e9l\u00e9ment poss\u00e9dant un fort moment magn\u00e9tique dans son \u00e9tat fondamental ( \u00b5 = 6\u00b5B, contre \u00b5= 1 \u00b5B pour les syst\u00e8mes alcalins). 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L\u2019interaction dip\u00f4le-dip\u00f4le ainsi induite se d\u00e9marque [&hellip;]","og_url":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/","og_site_name":"Magnetic Quantum Gases","article_published_time":"2011-11-03T19:54:00+00:00","article_modified_time":"2025-10-28T14:25:23+00:00","author":"Benjamin PASQUIOU","twitter_misc":{"Written by":"Benjamin PASQUIOU","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/#article","isPartOf":{"@id":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/"},"author":{"name":"Benjamin PASQUIOU","@id":"https:\/\/gqm.lpl.univ-paris13.fr\/#\/schema\/person\/edd1441f419c30858a44ed007fc1fc79"},"headline":"Effects of dipole-dipole interaction on magnetic properties of a chromium condensate","datePublished":"2011-11-03T19:54:00+00:00","dateModified":"2025-10-28T14:25:23+00:00","mainEntityOfPage":{"@id":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/"},"wordCount":689,"publisher":{"@id":"https:\/\/gqm.lpl.univ-paris13.fr\/#organization"},"keywords":["Benjamin Pasquiou"],"articleSection":["PhD thesis"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/","url":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/11\/03\/benjamin-pasquiou\/","name":"Effects of dipole-dipole interaction on magnetic properties of a chromium condensate - 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