{"id":575,"date":"2009-10-29T14:01:00","date_gmt":"2009-10-29T13:01:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=575"},"modified":"2025-10-28T15:25:45","modified_gmt":"2025-10-28T14:25:45","slug":"condensation-de-bose-einstein-du-chrome","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2009\/10\/29\/condensation-de-bose-einstein-du-chrome\/","title":{"rendered":"Condensation de Bose-Einstein du chrome"},"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>Its large magnetic moment in the ground state makes chromium a good candidate for the study of dipolar interactions in a degenerate gas. We have built an experimental setup for trapping and cooling atoms of <sup>52<\/sup>Cr down to Bose-Einstein condensation (BEC). Evaporative cooling takes place in a purely optical trap, which is loaded from the magneto-optical trap using a novel process of continuous accumulation of metastable states. We produce a condensate of typically 15 000 atoms in a time of 15 s.<\/p>\n\n\n\n<p>We studied the possibility to bring all the Zeeman substates of a chromium BEC to degeneracy in a non-zero static magnetic field, using a radiofrequency (rf) magnetic field, and demonstrated a new process of rf-assisted dipolar relaxation. We also studied a narrow Feshbach resonance induced by dipolar interaction, which implies a d-wave collisional chanel. We analyzed this resonance in the presence of a rf magnetic field and we reinterpreted rf association of molecules as a mere Feshbach resonance between rf dressed states. Finally, we have set up an optical lattice in the perspective of studying the effects of dipole-dipole interactions in reduced dimension.<\/p>\n\n\n\n<div class=\"wp-block-columns are-vertically-aligned-center is-layout-flex wp-container-core-columns-is-layout-28f84493 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-d0829874-26bc-4378-81e9-bf979153e5a2\" href=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/10\/2009-Thesis-Quentin-Beaufils.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">2009 &#8211; Thesis &#8211; Quentin Beaufils<\/a><a href=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/10\/2009-Thesis-Quentin-Beaufils.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-d0829874-26bc-4378-81e9-bf979153e5a2\">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><a href=\"https:\/\/theses.hal.science\/tel-01163706v1\" data-type=\"link\" data-id=\"https:\/\/theses.hal.science\/tel-01163706v1\" 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><em>Soutenance de th\u00e8se de Quentin Beaufils<\/em><br><strong>Date:<\/strong> Jeudi 29 octobre 2009<br><strong>Location:<\/strong> 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>Chromium, Bose-Einstein condensation, dipolar interactions, Feshbach resonances, dipolar relaxation.<\/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>Pierre Pillet (President)<\/li>\n\n\n\n<li>Denis Boiron (Referee)<\/li>\n\n\n\n<li>David Gu\u00e9ry-Odelin (Referee)<\/li>\n\n\n\n<li>Ennio Arimondo (Examiner)<\/li>\n\n\n\n<li>Daniel Bloch (Examiner)<\/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\">Condensation de Bose-Einstein du chrome<\/h3>\n\n\n\n<p>A cause de son fort moment magn\u00e9tique dans l\u2019\u00e9tat fondamental, le chrome est un bon candidat pour l\u2019\u00e9tude des interactions dipolaires dans un gaz d\u00e9g\u00e9n\u00e9r\u00e9. Nous avons mis en place un dispositif exp\u00e9rimental afin de pi\u00e9ger et de refroidir des atomes de <sup>52<\/sup>Cr jusqu\u2019\u00e0 la condensation de Bose-Einstein. Le refroidissement \u00e9vaporatif a lieu dans un pi\u00e8ge optique, dont le chargement \u00e0 partir du pi\u00e8ge magn\u00e9to-optique est r\u00e9alis\u00e9 gr\u00e2ce \u00e0 une m\u00e9thode originale d\u2019accumulation en continu d\u2019atomes dans des \u00e9tats m\u00e9tastables. Nous produisons un condensat contenant typiquement 15 000 atomes en 15 s au total.<\/p>\n\n\n\n<p>Nous avons \u00e9tudi\u00e9 la possibilit\u00e9 d\u2019amener les sous-\u00e9tats Zeeman du chrome condens\u00e9 \u00e0 d\u00e9g\u00e9n\u00e9rescence dans un champ magn\u00e9tique statique non nul, en utilisant un champ magn\u00e9tique radiofr\u00e9quence (rf). Cela nous a conduit \u00e0 mettre en \u00e9vidence un processus de relaxation dipolaire assist\u00e9e par la rf. Nous avons \u00e9galement \u00e9tudi\u00e9 une r\u00e9sonance de Feshbach induite par l\u2019interaction dipolaire, qui a la particularit\u00e9 d\u2019impliquer un canal de collisions en onde d. Nous avons analys\u00e9 cette r\u00e9sonance en pr\u00e9sence de champs rf, et r\u00e9interpr\u00e9t\u00e9 l\u2019association rf de mol\u00e9cules comme une simple r\u00e9sonance de Feshbach entre \u00e9tats habill\u00e9s. Enfin, nous avons mis en place un r\u00e9seau optique dans la perspective d\u2019\u00e9tudier l\u2019effet des interactions dip\u00f4le-dip\u00f4le en dimension r\u00e9duite.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>French version: Condensation de Bose-Einstein du chrome A cause de son fort moment magn\u00e9tique dans l\u2019\u00e9tat fondamental, le chrome est un bon candidat pour l\u2019\u00e9tude des interactions dipolaires dans un gaz d\u00e9g\u00e9n\u00e9r\u00e9. Nous avons mis en place un dispositif exp\u00e9rimental afin de pi\u00e9ger et de refroidir des atomes de 52Cr jusqu\u2019\u00e0 la condensation de Bose-Einstein. [&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":[151],"class_list":["post-575","post","type-post","status-publish","format-standard","hentry","category-phd-thesis","tag-quentin-beaufils"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Condensation de Bose-Einstein du chrome - 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\/2009\/10\/29\/condensation-de-bose-einstein-du-chrome\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Condensation de Bose-Einstein du chrome - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"French version: Condensation de Bose-Einstein du chrome A cause de son fort moment magn\u00e9tique dans l\u2019\u00e9tat fondamental, le chrome est un bon candidat pour l\u2019\u00e9tude des interactions dipolaires dans un gaz d\u00e9g\u00e9n\u00e9r\u00e9. Nous avons mis en place un dispositif exp\u00e9rimental afin de pi\u00e9ger et de refroidir des atomes de 52Cr jusqu\u2019\u00e0 la condensation de Bose-Einstein. 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