Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium

A fundamental question in many-body physics is how closed quantum systems reach equilibrium. We address this question experimentally and theoretically in an ultracold large-spin Fermi gas where we find a complex interplay between internal and motional degrees of freedom. The fermions are initially p...

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Autores principales:	Ulrich Ebling, Jasper Simon Krauser, Nick Fläschner, Klaus Sengstock, Christoph Becker, Maciej Lewenstein, André Eckardt
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2014
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/60683d910a014871a086c6c99843c85e
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spelling	oai:doaj.org-article:60683d910a014871a086c6c99843c85e2021-12-02T11:47:57ZRelaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium10.1103/PhysRevX.4.0210112160-3308https://doaj.org/article/60683d910a014871a086c6c99843c85e2014-04-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.4.021011http://doi.org/10.1103/PhysRevX.4.021011https://doaj.org/toc/2160-3308A fundamental question in many-body physics is how closed quantum systems reach equilibrium. We address this question experimentally and theoretically in an ultracold large-spin Fermi gas where we find a complex interplay between internal and motional degrees of freedom. The fermions are initially prepared far from equilibrium with only a few spin states occupied. The subsequent dynamics leading to redistribution among all spin states is observed experimentally and simulated theoretically using a kinetic Boltzmann equation with full spin coherence. The latter is derived microscopically and provides good agreement with experimental data without any free parameters. We identify several collisional processes that occur on different time scales. By varying density and magnetic field, we control the relaxation dynamics and are able to continuously tune the character of a subset of spin states from an open to a closed system.Ulrich EblingJasper Simon KrauserNick FläschnerKlaus SengstockChristoph BeckerMaciej LewensteinAndré EckardtAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 4, Iss 2, p 021011 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Ulrich Ebling Jasper Simon Krauser Nick Fläschner Klaus Sengstock Christoph Becker Maciej Lewenstein André Eckardt Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
description	A fundamental question in many-body physics is how closed quantum systems reach equilibrium. We address this question experimentally and theoretically in an ultracold large-spin Fermi gas where we find a complex interplay between internal and motional degrees of freedom. The fermions are initially prepared far from equilibrium with only a few spin states occupied. The subsequent dynamics leading to redistribution among all spin states is observed experimentally and simulated theoretically using a kinetic Boltzmann equation with full spin coherence. The latter is derived microscopically and provides good agreement with experimental data without any free parameters. We identify several collisional processes that occur on different time scales. By varying density and magnetic field, we control the relaxation dynamics and are able to continuously tune the character of a subset of spin states from an open to a closed system.
format	article
author	Ulrich Ebling Jasper Simon Krauser Nick Fläschner Klaus Sengstock Christoph Becker Maciej Lewenstein André Eckardt
author_facet	Ulrich Ebling Jasper Simon Krauser Nick Fläschner Klaus Sengstock Christoph Becker Maciej Lewenstein André Eckardt
author_sort	Ulrich Ebling
title	Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
title_short	Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
title_full	Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
title_fullStr	Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
title_full_unstemmed	Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium
title_sort	relaxation dynamics of an isolated large-spin fermi gas far from equilibrium
publisher	American Physical Society
publishDate	2014
url	https://doaj.org/article/60683d910a014871a086c6c99843c85e
work_keys_str_mv	AT ulrichebling relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT jaspersimonkrauser relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT nickflaschner relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT klaussengstock relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT christophbecker relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT maciejlewenstein relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium AT andreeckardt relaxationdynamicsofanisolatedlargespinfermigasfarfromequilibrium
_version_	1718395229570072576

Relaxation Dynamics of an Isolated Large-Spin Fermi Gas Far from Equilibrium

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