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dc.contributor.authorSommer, Ariel Tjodolv
dc.contributor.authorRoati, Giacomo
dc.contributor.authorZwierlein, Martin Wolfram
dc.contributor.authorKu, Mark J. H.
dc.date.accessioned2012-06-12T17:53:30Z
dc.date.available2012-06-12T17:53:30Z
dc.date.issued2011-04
dc.date.submitted2011-01
dc.identifier.issn0028-0836
dc.identifier.issn1476-4687
dc.identifier.urihttp://hdl.handle.net/1721.1/71134
dc.description.abstractTransport of fermions is central in many elds of physics. Electron transport runs modern technology, de ning states of matter such as superconductors and insulators, and electron spin, rather than charge, is being explored as a new carrier of information [1]. Neutrino transport energizes supernova explosions following the collapse of a dying star [2], and hydrodynamic transport of the quark-gluon plasma governed the expansion of the early Universe [3]. However, our understanding of non-equilibrium dynamics in such strongly interacting fermionic matter is still limited. Ultracold gases of fermionic atoms realize a pristine model for such systems and can be studied in real time with the precision of atomic physics [4, 5]. It has been established that even above the super uid transition such gases ow as an almost perfect uid with very low viscosity [3, 6] when interactions are tuned to a scattering resonance. However, here we show that spin currents, as opposed to mass currents, are maximally damped, and that interactions can be strong enough to reverse spin currents, with opposite spin components reflecting off each other. We determine the spin drag coefficient, the spin di usivity, and the spin susceptibility, as a function of temperature on resonance and show that they obey universal laws at high temperatures. At low temperatures, the spin di usivity approaches a minimum value set by ħ/m, the quantum limit of di usion, where ħ is the reduced Planck's constant and m the atomic mass. For repulsive interactions, our measurements appear to exclude a metastable ferromagnetic state [7{9].en_US
dc.description.sponsorshipNational Science Foundation (U.S.)en_US
dc.description.sponsorshipUnited States. Office of Naval Researchen_US
dc.description.sponsorshipUnited States. Army Research Office (DARPA OLE programme)en_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.description.sponsorshipUnited States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiativeen_US
dc.description.sponsorshipUnited States. Army Research Office. Multidisciplinary University Research Initiativeen_US
dc.description.sponsorshipUnited States. Defense Advanced Research Projects Agency. Young Faculty Awarden_US
dc.description.sponsorshipDavid & Lucile Packard Foundationen_US
dc.language.isoen_US
dc.publisherNature Publishing Groupen_US
dc.relation.isversionofhttp://dx.doi.org/10.1038/nature09989en_US
dc.rightsCreative Commons Attribution-Noncommercial-Share Alike 3.0en_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/en_US
dc.sourceProf. Zwierlein via Mat Willmotten_US
dc.titleUniversal Spin Transport in a Strongly Interacting Fermi Gasen_US
dc.typeArticleen_US
dc.identifier.citationSommer, Ariel et al. “Universal spin transport in a strongly interacting Fermi gas.” Nature 472.7342 (2011): 201-204.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMassachusetts Institute of Technology. Research Laboratory of Electronicsen_US
dc.contributor.departmentMIT-Harvard Center for Ultracold Atomsen_US
dc.contributor.approverZwierlein, Martin Wolfram
dc.contributor.mitauthorSommer, Ariel Tjodolv
dc.contributor.mitauthorKu, Mark Jen-Hao
dc.contributor.mitauthorZwierlein, Martin Wolfram
dc.relation.journalNatureen_US
dc.eprint.versionAuthor's final manuscripten_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsSommer, Ariel; Ku, Mark; Roati, Giacomo; Zwierlein, Martin W.en
dc.identifier.orcidhttps://orcid.org/0000-0003-1391-0428
dc.identifier.orcidhttps://orcid.org/0000-0001-8120-8548
mit.licenseOPEN_ACCESS_POLICYen_US
mit.metadata.statusComplete


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