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SUMMARY:Quantum transport in strongly interacting Fermi gases - Prof. Mart
 in Zwierlein  Massachusetts Institute of Technology\, Cambridge MA\, USA
DTSTART:20180704T100000Z
DTEND:20180704T110000Z
UID:TALK108019@talks.cam.ac.uk
CONTACT:Dr Ulrich Schneider
DESCRIPTION:Understanding transport in strongly interacting systems of fer
 mions is one of the outstanding challenges in many-body physics. There exi
 st many open questions even on the qualitative features of such transport\
 , whether it can be described by quasi-particles\, whether heat\, charge a
 nd spin are transported together or separately\, and how transport propert
 ies change across phase transitions. I will present measurements of sound 
 attenuation in strongly interacting\, homogeneous Fermi gases\, which reve
 al quantum limited sound diffusivity even in the superfluid regime. For Fe
 rmi gases in the Hubbard regime\, observed under a microscope with single-
 atom resolution\, we performed studies of spin transport in the Mott insul
 ating regime\, where charge is frozen but spins are free to diffuse. We ob
 tain spin diffusivities revealing super-exchange scaling\, with contributi
 ons from direct tunnelling of spins facilitated by doublon-hole fluctuatio
 ns.\n\n
LOCATION:Rutherford building\, Seminar Room B
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