{"id":1502,"date":"2011-03-24T21:22:00","date_gmt":"2011-03-24T20:22:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=1502"},"modified":"2025-11-08T15:44:34","modified_gmt":"2025-11-08T14:44:34","slug":"spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/03\/24\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\/","title":{"rendered":"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field"},"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 observe a demagnetization of the Bose-Einstein condensate (BEC) when the magnetic field is quenched below a critical value corresponding to a phase transition between a ferromagnetic and a nonpolarized ground state, which occurs when spin-dependent contact interactions overwhelm the linear Zeeman effect. The critical field is increased when the density is raised by loading the BEC in a deep 2D optical lattice.<\/p>\n\n\n\n<p>The magnetization dynamics is set by dipole-dipole interactions.<\/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-8dc780bc\" 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-Spontaneous-demagnetization-f95a41.svg\" alt=\"\" class=\"wp-image-1641\" style=\"border-style:none;border-width:0px;border-radius:10px\"\/><figcaption class=\"wp-element-caption\">Chromium BEC spin composition at low fields, revealed by Stern-Gerlach analysis. The BEC spontaneously depolarizes as the magnetic field is lowered.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>We study the spinor properties of \ud835\udc46 =3 52Cr condensates, in which dipole-dipole interactions allow changes in magnetization.<br \/>\n<a href=\"https:\/\/doi.org\/10.48550\/arXiv.1103.4819\">arXiv:1103.4819 (2011)<\/a>  \/  <a href=\"https:\/\/doi.org\/10.1103\/PhysRevLett.106.255303\">Phys. Rev. Lett. 106, 255303 (2011)<\/a><\/p>\n","protected":false},"author":3,"featured_media":1641,"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":[28,26,31,77,61,42,44],"class_list":["post-1502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-article","category-chromium","category-theory","tag-benjamin-pasquiou","tag-bruno-laburthe-tolra","tag-etienne-marechal","tag-gabriel-bismut","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>Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field - 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\/03\/24\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"We study the spinor properties of \ud835\udc46 =3 52Cr condensates, in which dipole-dipole interactions allow changes in magnetization. arXiv:1103.4819 (2011) \/ Phys. Rev. Lett. 106, 255303 (2011)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/03\/24\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\/\" \/>\n<meta property=\"og:site_name\" content=\"Magnetic Quantum Gases\" \/>\n<meta property=\"article:published_time\" content=\"2011-03-24T20:22:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-08T14:44:34+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<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\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/\"},\"author\":{\"name\":\"Benjamin PASQUIOU\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\"},\"headline\":\"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field\",\"datePublished\":\"2011-03-24T20:22:00+00:00\",\"dateModified\":\"2025-11-08T14:44:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/\"},\"wordCount\":104,\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Spontaneous-demagnetization-f95a41.svg\",\"keywords\":[\"Benjamin Pasquiou\",\"Bruno Laburthe-Tolra\",\"Etienne Mar\u00e9chal\",\"Gabriel Bismut\",\"Laurent Vernac\",\"Olivier Gorceix\",\"Paolo Pedri\"],\"articleSection\":[\"Article\",\"Chromium\",\"Theory\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/\",\"name\":\"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field - Magnetic Quantum Gases\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Spontaneous-demagnetization-f95a41.svg\",\"datePublished\":\"2011-03-24T20:22:00+00:00\",\"dateModified\":\"2025-11-08T14:44:34+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#primaryimage\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Spontaneous-demagnetization-f95a41.svg\",\"contentUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/11\\\/Article-Spontaneous-demagnetization-f95a41.svg\",\"width\":300,\"height\":300,\"caption\":\"Chromium BEC spin composition at low fields, revealed by Stern-Gerlach analysis. The BEC spontaneously depolarizes as the magnetic field is lowered.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/2011\\\/03\\\/24\\\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#website\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/\",\"name\":\"Magnetic Quantum Gases\",\"description\":\"Explore quantum magnetism with ultra-cold atom gases.\",\"publisher\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#organization\",\"name\":\"Magnetic Quantum Gases\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/cropped-Condensation_512px.png\",\"contentUrl\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/cropped-Condensation_512px.png\",\"width\":512,\"height\":512,\"caption\":\"Magnetic Quantum Gases\"},\"image\":{\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/#\\\/schema\\\/person\\\/edd1441f419c30858a44ed007fc1fc79\",\"name\":\"Benjamin PASQUIOU\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f830cb90b39b89a47400329189c692407a76ff849fbc89ac7df353e712db23e0?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f830cb90b39b89a47400329189c692407a76ff849fbc89ac7df353e712db23e0?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f830cb90b39b89a47400329189c692407a76ff849fbc89ac7df353e712db23e0?s=96&d=mm&r=g\",\"caption\":\"Benjamin PASQUIOU\"},\"url\":\"https:\\\/\\\/gqm.lpl.univ-paris13.fr\\\/index.php\\\/author\\\/benjamin-pasquiou\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field - Magnetic Quantum Gases","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2011\/03\/24\/spontaneous-demagnetization-of-a-dipolar-spinor-bose-gas-at-ultralow-magnetic-field\/","og_locale":"en_US","og_type":"article","og_title":"Spontaneous demagnetization of a dipolar spinor Bose gas at ultralow magnetic field - Magnetic Quantum Gases","og_description":"We study the spinor properties of \ud835\udc46 =3 52Cr condensates, in which dipole-dipole interactions allow changes in magnetization. arXiv:1103.4819 (2011) \/ Phys. 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