{"id":585,"date":"2016-12-06T14:12:00","date_gmt":"2016-12-06T13:12:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=585"},"modified":"2025-10-28T15:23:58","modified_gmt":"2025-10-28T14:23:58","slug":"quantum-gases-of-chromium-thermodynamics-and-magnetic-properties-of-a-bose-einstein-condensate-and-production-of-a-fermi-sea","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2016\/12\/06\/quantum-gases-of-chromium-thermodynamics-and-magnetic-properties-of-a-bose-einstein-condensate-and-production-of-a-fermi-sea\/","title":{"rendered":"Quantum gases of chromium: thermodynamics and magnetic properties of a Bose-Einstein condensate and production of a Fermi sea"},"content":{"rendered":"\n
<\/div>
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Abstract:<\/strong><\/h4>\n\n\n\n

This thesis presents experimental results performed with quantum gases of chromium atoms. The specificity of Chromium resides in its large electronic spin s=3 and non negligible dipole-dipole interaction between atoms.<\/p>\n\n\n\n

We produced a new quantum gas, a Fermi sea of the 53<\/sup>Cr isotope. Optimization of the co-evaporation with the 52<\/sup>Cr bosonic isotope leads to 103<\/sup> atoms at T\/TF<\/sub> = 0.66.<\/p>\n\n\n\n

We obtained new results on thermodynamics of a spinor Bose gas. By “shock cooling” a thermal multi-spin component gas, we \ffind that the condensation dynamics is a\u000bffected by spin changing collisions. We also demonstrate a new cooling mechanism based on the spin degrees of freedom when the Bose-Einstein condensate (BEC) is in the lowest energy spin state. Dipolar interactions thermally populate spin-excited states at low magnetic fi\feld. Puri\fcation of the BEC is obtained by selectively removing these thermal atoms.<\/p>\n\n\n\n

Finally, we present spin dynamics experiments. In a \ffirst experiment, spin dynamics following preparation of atoms in a double well trap in opposite stretch spin states allow to measure the last unknown scattering length of 52<\/sup>Cr: a0<\/sub> = 13.5 +15-10 aB<\/sub> (with aB<\/sub> the Bohr radius). We then present preliminary results performed in a 3D lattice and in the bulk, where spin excitation is performed by a spin rotation. We investigate for different experimental configurations which of a theory with or without quantum correlations \ffits best our data.<\/p>\n\n\n\n

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2016 – Thesis – Bruno Naylor<\/a>Download<\/a><\/div>\n<\/div>\n\n\n\n
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Link to HAL<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n

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Soutenance de th\u00e8se de Bruno Naylor<\/em>
Date:<\/strong> Mardi 6 d\u00e9cembre 2016
Location:<\/strong> Laboratoire de Physique des Lasers, 99 av. J.B. Cl\u00e9ment 93430 Villetaneuse France<\/p>\n\n\n\n

Keywords:<\/strong><\/h4>\n\n\n\n

Bose-Einstein condensate, Fermi sea, dipolar interactions, thermodynamics for magnetism, cooling, optical lattices.<\/p>\n\n\n\n

Jury:<\/strong><\/h4>\n\n\n\n
    \n
  • Vincent Lorent (President)<\/li>\n\n\n\n
  • Antoine Browaeys (Referee)<\/li>\n\n\n\n
  • Fabrice Gerbier (Referee)<\/li>\n\n\n\n
  • Matteo Zaccanti (Examiner)<\/li>\n\n\n\n
  • Laurent Vernac (Co-supervisor)<\/li>\n\n\n\n
  • Bruno Laburthe-Tolra (Supervisor)<\/li>\n<\/ul>\n<\/div>\n<\/div><\/div>\n\n\n\n

    French version:<\/h4>\n\n\n\n

    Gaz quantiques de chrome: propri\u00e9t\u00e9s thermodynamiques et magn\u00e9tiques d’un condensat de Bose-Einstein et production d’une mer de Fermi<\/h3>\n\n\n\n

    Le manuscrit pr\u00e9sente des exp\u00e9riences r\u00e9alis\u00e9es avec des gaz quantiques de chrome, un \u00e9l\u00e9ment pr\u00e9sentant un large spin \u00e9lectronique s=3 et des interactions dipolaires non n\u00e9gligeables.<\/p>\n\n\n\n

    Nous avons produit un nouveau gaz quantique, une mer de Fermi avec l’isotope 53<\/sup>Cr contenant jusqu’\u00e0 1000 atomes \u00e0 T\/TF<\/sub> = 0.66 +\/-0.08 , en optimisant la co-\u00e9vaporation avec l’isotope bosonique.<\/p>\n\n\n\n

    Nous avons obtenu de nouveaux r\u00e9sultats sur la thermodynamique d’un condensat de Bose Einstein (CBE) avec degr\u00e9 de libert\u00e9 de spin. En refroidissant rapidement un gaz thermique multi-composantes, nous observons que la dynamique de condensation est affect\u00e9e par les collisions d’\u00e9change de spin. Nous d\u00e9montrons aussi un nouveau m\u00e9canisme de refroidissement, utilisant le degr\u00e9 de libert\u00e9 de spin, lorsque le CBE est produit dans le niveau de spin de plus basse \u00e9nergie. Les interactions dipolaires peuplent thermiquement les \u00e9tats de spin excit\u00e9s \u00e0 bas champ magn\u00e9tique, et une purifcation du CBE est obtenue en retirant s\u00e9lectivement ces atomes.<\/p>\n\n\n\n

    Enfin nous pr\u00e9sentons des exp\u00e9riences de dynamique de spin. Dans une premi\u00e8re exp\u00e9rience, cette dynamique est obtenue en utilisant un double puits avec des \u00e9tats de spin oppos\u00e9s. Ceci a permis une premi\u00e8re mesure d’une des longueurs de diffusion du 52<\/sup>Cr: a0<\/sub> = 13.5 +15-10 aB<\/sub>. Nous pr\u00e9sentons \u00e9galement des r\u00e9sultats pr\u00e9liminaires dans un pi\u00e8ge harmonique et dans un r\u00e9seau 3D. La dynamique de spin est produite par rotation du spin des atomes. La comparaison avec la th\u00e9orie nous permet de mettre en \u00e9vidence l’apparition de corr\u00e9lations quantiques.<\/p>\n","protected":false},"excerpt":{"rendered":"

    French version: Gaz quantiques de chrome: propri\u00e9t\u00e9s thermodynamiques et magn\u00e9tiques d’un condensat de Bose-Einstein et production d’une mer de Fermi Le manuscrit pr\u00e9sente des exp\u00e9riences r\u00e9alis\u00e9es avec des gaz quantiques de chrome, un \u00e9l\u00e9ment pr\u00e9sentant un large spin \u00e9lectronique s=3 et des interactions dipolaires non n\u00e9gligeables. Nous avons produit un nouveau gaz quantique, une mer […]<\/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":[153],"class_list":["post-585","post","type-post","status-publish","format-standard","hentry","category-phd-thesis","tag-bruno-naylor"],"blocksy_meta":[],"yoast_head":"\nQuantum gases of chromium: thermodynamics and magnetic properties of a Bose-Einstein condensate and production of a Fermi sea - 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\/2016\/12\/06\/quantum-gases-of-chromium-thermodynamics-and-magnetic-properties-of-a-bose-einstein-condensate-and-production-of-a-fermi-sea\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quantum gases of chromium: thermodynamics and magnetic properties of a Bose-Einstein condensate and production of a Fermi sea - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"French version: Gaz quantiques de chrome: propri\u00e9t\u00e9s thermodynamiques et magn\u00e9tiques d’un condensat de Bose-Einstein et production d’une mer de Fermi Le manuscrit pr\u00e9sente des exp\u00e9riences r\u00e9alis\u00e9es avec des gaz quantiques de chrome, un \u00e9l\u00e9ment pr\u00e9sentant un large spin \u00e9lectronique s=3 et des interactions dipolaires non n\u00e9gligeables. 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