{"id":1487,"date":"2014-07-30T20:51:00","date_gmt":"2014-07-30T18:51:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=1487"},"modified":"2025-11-08T21:22:20","modified_gmt":"2025-11-08T20:22:20","slug":"dipolar-atomic-spin-ensembles-in-a-double-well-potential","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2014\/07\/30\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\/","title":{"rendered":"Dipolar atomic spin ensembles in a double-well potential"},"content":{"rendered":"\n<div class=\"wp-block-columns 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\" style=\"flex-basis:66.66%\">\n<p>We use a radio-frequency sweep to selectively flip the spin of the atoms in one of the wells, which produces two separated spin domains of opposite polarization.<\/p>\n\n\n\n<p>We observe that these engineered spin domains are metastable with respect to the long-range magnetic dipolar interactions between the two ensembles. The absence of intercloud dipolar spin-exchange processes reveals a classical behavior, in contrast to previous results with atoms loaded in an optical lattice.<\/p>\n\n\n\n<p>When we merge the two subsystems, we observe spin-exchange dynamics due to contact interactions which enable the determination of the \ud835\udc60-wave scattering length of 52Cr atoms in the \ud835\udc46=0 molecular channel \ud835\udc4e0=13.5+11\u221210.5\u2062\ud835\udc4e\ud835\udc35 (where \ud835\udc4e\ud835\udc35 is the Bohr radius).<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image aligncenter size-full has-custom-border is-style-rounded wp-duotone-unset-1\" id=\"wp-block-themeisle-blocks-image-51e9fb8e\" style=\"margin-top:var(--wp--preset--spacing--20);margin-right:var(--wp--preset--spacing--20);margin-bottom:var(--wp--preset--spacing--20);margin-left:var(--wp--preset--spacing--20)\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/gqm.lpl.univ-paris13.fr\/wp-content\/uploads\/2025\/11\/Article-Double-well-8f41a8.svg\" alt=\"\" class=\"wp-image-1686\" style=\"border-style:none;border-width:0px;border-radius:10px\"\/><figcaption class=\"wp-element-caption\">a) A two-beam 532 nm laser interference pattern creates a spatially modulated trapping potential. b) An average over 45 in-situ absorption images shows that atoms populate two wells. c) An absorption image taken after 5ms of time of flight reveals interferences between the two BECs.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>We experimentally study the spin dynamics of mesoscopic ensembles of ultracold magnetic spin-3 atoms located in two separated wells of an optical dipole trap.<br \/>\n<a href=\"https:\/\/doi.org\/10.48550\/arXiv.1407.8130\">arXiv:1407.8130 (2014)<\/a>  \/  <a href=\"https:\/\/doi.org\/10.1103\/PhysRevA.90.043607\">Phys. Rev. A 90, 043607 (2014)<\/a><\/p>\n","protected":false},"author":3,"featured_media":1686,"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":[18,63,129],"tags":[221,79,26,153,31,30,61,42,44],"class_list":["post-1487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-chromium","category-theory","tag-ariane-carrance","tag-aurelie-de-paz","tag-bruno-laburthe-tolra","tag-bruno-naylor","tag-etienne-marechal","tag-john-h-huckans","tag-laurent-vernac","tag-olivier-gorceix","tag-paolo-pedri"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dipolar atomic spin ensembles in a double-well potential - 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\/2014\/07\/30\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dipolar atomic spin ensembles in a double-well potential - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"We experimentally study the spin dynamics of mesoscopic ensembles of ultracold magnetic spin-3 atoms located in two separated wells of an optical dipole trap. arXiv:1407.8130 (2014) \/ Phys. 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A 90, 043607 (2014)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2014\/07\/30\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2014-07-30T18:51:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-08T20:22:20+00:00\" \/>\n<meta name=\"author\" content=\"Benjamin PASQUIOU\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin PASQUIOU\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2014\\\/07\\\/30\\\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2014\\\/07\\\/30\\\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Dipolar atomic spin ensembles in a double-well potential\",\"datePublished\":\"2014-07-30T18:51:00+00:00\",\"dateModified\":\"2025-11-08T20:22:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2014\\\/07\\\/30\\\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\\\/\"},\"wordCount\":157,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2014\\\/07\\\/30\\\/dipolar-atomic-spin-ensembles-in-a-double-well-potential\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Double-well-8f41a8.svg\",\"keywords\":[\"Ariane Carrance\",\"Aur\u00e9lie de Paz\",\"Bruno Laburthe-Tolra\",\"Bruno Naylor\",\"Etienne Mar\u00e9chal\",\"John H. 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