{"id":493,"date":"2015-06-16T21:33:00","date_gmt":"2015-06-16T19:33:00","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?p=493"},"modified":"2025-10-28T15:24:24","modified_gmt":"2025-10-28T14:24:24","slug":"spin-exchange-and-magnetization-dynamics-of-a-dipolar-quantum-gas","status":"publish","type":"post","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/2015\/06\/16\/spin-exchange-and-magnetization-dynamics-of-a-dipolar-quantum-gas\/","title":{"rendered":"Spin exchange and magnetization dynamics of a dipolar quantum gas"},"content":{"rendered":"\n
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Abstract:<\/strong><\/h4>\n\n\n\n

This thesis reports on several experimental studies of magnetic properties of a Chromium Bose-Einstein condensate loaded into a 3D optical lattice, focusing on the e\u000bffects induced by dipolar interactions.<\/p>\n\n\n\n

We show that in a 3D lattice dipolar relaxation is a resonant process due to the reduction of the density of
accessible orbital states. These resonances are observed for magnetic fields Bres such that the Zeeman energy released matches an excitation towards higher-energy bands of the lattice. We can thus inhibit those processes by applying a field different from Bres. Analyses of the resonances allowed us to probe the lattice 3D band structure as well as to demonstrate the effects of local interactions between atoms. We study spin exchange dynamics in a 3D lattice. We especially observed for the first time spin exchange
between atoms localized in different lattice sites mediated by dipolar interactions. These studies are the first step toward a new exploration of magnetism in lattice. Varying the depth of the lattice we study these effects in the superfluid regime, well described by mean filed theories, as well as in the strongly correlated regime, whose theoretical description is still challenging.<\/p>\n\n\n\n

Finally, we study the evolution dynamics of two giant spins interacting through dipolar interactions. The condensate being initially split in half, atoms from the two clouds are prepared in opposite spin states thus producing two giant spins. We show that any spin dynamics is energetically inhibited for large spins which is well accounted for by a classical theory.<\/p>\n\n\n\n

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2015 – Thesis – Aur\u00e9lie de Paz<\/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 Aur\u00e9lie de Paz<\/em>
Date:<\/strong> Mardi 16 juin 2015
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 Condensation, dipolar interactions, ultracold chromium atoms, optical lattices, dipolar relaxation, spin exchange, macrospin, quantum magnetism.<\/p>\n\n\n\n

Jury:<\/strong><\/h4>\n\n\n\n
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  • Thierry Lahaye (Referee)<\/li>\n\n\n\n
  • Guillaume Labeyrie (Referee)<\/li>\n\n\n\n
  • Alberto Bramati (Examiner)<\/li>\n\n\n\n
  • Fr\u00e9d\u00e9ric Du Burk (Examiner)<\/li>\n\n\n\n
  • Olivier Gorceix (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

    \u00c9change de spin et dynamique d\u2019aimantation d\u2019un gaz quantique dipolaire<\/h3>\n\n\n\n

    Dans ce m\u00e9moire nous pr\u00e9sentons plusieurs \u00e9tudes exp\u00e9rimentales des propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de Bose-Einstein de Chrome charg\u00e9 dans un r\u00e9seau 3D, en nous focalisant sur les effets associ\u00e9s aux interactions dipolaires.<\/p>\n\n\n\n


    Nous montrons que dans un r\u00e9seau 3D, la relaxation dipolaire est un processus r\u00e9sonant du fait de la r\u00e9duction de la densit\u00e9 d\u2019\u00e9tats orbitaux accessibles. Les r\u00e9sonances sont observ\u00e9es \u00e0 des champs magn\u00e9tiques Bres tels que l\u2019\u00e9nergie Zeeman rel\u00e2ch\u00e9e soit \u00e9gale \u00e0 l\u2019\u00e9nergie n\u00e9cessaire \u00e0 exciter les atomes dans une bande d\u2019\u00e9nergie sup\u00e9rieure du r\u00e9seau. Nous pouvons inhiber ce processus en appliquant un champ diff\u000b\u00e9rent de Bres. L\u2019analyse des r\u00e9sonances a permis de sonder la structure de bande 3D du r\u00e9seau, ainsi que la mise en \u00e9vidence de l\u2019effet des interactions entre atomes. Nous avons \u00e9tudi\u00e9 la dynamique d\u2019\u00e9change de spin dans un r\u00e9seau 3D. Nous pr\u00e9sentons en particulier la premi\u00e8re observation d\u2019\u00e9change de spin entre atomes localis\u00e9s dans des sites s\u00e9par\u00e9s. Ces \u00e9tudes permettent une exploration nouvelle du magn\u00e9tisme en r\u00e9seau. En variant la profondeur du r\u00e9seau, nous \u00e9tudions ces effets dans le r\u00e9gime superfluide, bien d\u00e9crit par une th\u00e9orie de champ moyen, et dans le r\u00e9gime fortement corr\u00e9l\u00e9, dont la description th\u00e9orique est diffcile.<\/p>\n\n\n\n


    Enfin, nous \u00e9tudions l\u2019\u00e9volution de deux spins g\u00e9ants interagissant par interaction dipolaire. Le condensat initialement divis\u00e9 en deux, les atomes des deux nuages sont pr\u00e9par\u00e9s dans des \u00e9tats de spin oppos\u00e9s formant ainsi deux spins g\u00e9ants. Nous montrons que toute dynamique de spin est \u00e9nerg\u00e9tiquement inhib\u00e9e pour de grands spins ce qui est bien reproduit par une th\u00e9orie classique.<\/p>\n","protected":false},"excerpt":{"rendered":"

    French version: \u00c9change de spin et dynamique d\u2019aimantation d\u2019un gaz quantique dipolaire Dans ce m\u00e9moire nous pr\u00e9sentons plusieurs \u00e9tudes exp\u00e9rimentales des propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de Bose-Einstein de Chrome charg\u00e9 dans un r\u00e9seau 3D, en nous focalisant sur les effets associ\u00e9s aux interactions dipolaires. Nous montrons que dans un r\u00e9seau 3D, la relaxation dipolaire est […]<\/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":[79],"class_list":["post-493","post","type-post","status-publish","format-standard","hentry","category-phd-thesis","tag-aurelie-de-paz"],"blocksy_meta":[],"yoast_head":"\nSpin exchange and magnetization dynamics of a dipolar quantum gas - 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\/2015\/06\/16\/spin-exchange-and-magnetization-dynamics-of-a-dipolar-quantum-gas\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spin exchange and magnetization dynamics of a dipolar quantum gas - Magnetic Quantum Gases\" \/>\n<meta property=\"og:description\" content=\"French version: \u00c9change de spin et dynamique d\u2019aimantation d\u2019un gaz quantique dipolaire Dans ce m\u00e9moire nous pr\u00e9sentons plusieurs \u00e9tudes exp\u00e9rimentales des propri\u00e9t\u00e9s magn\u00e9tiques d\u2019un condensat de Bose-Einstein de Chrome charg\u00e9 dans un r\u00e9seau 3D, en nous focalisant sur les effets associ\u00e9s aux interactions dipolaires. 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