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SUMMARY:Solitonic waves in a Fermionic Superfluid - Martin Zwierlein (MIT)
DTSTART:20140131T150000Z
DTEND:20140131T160000Z
UID:TALK50495@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Solitons - solitary waves that maintain their shape as they pr
 opagate — occur as water waves in narrow canals\, as light pulses in opt
 ical fibres and as quantum mechanical matter waves in superfluids and supe
 rconductors. Their highly nonlinear and localized nature makes them very s
 ensitive probes of the medium in which they propagate. We create long-live
 d solitary waves in a strongly interacting superfluid of fermionic atoms a
 nd directly observe their motion [1]. As the interactions are tuned from t
 he regime of Bose–Einstein condensation of tightly bound molecules towar
 ds the Bardeen–Cooper–Schrieffer limit of long-range Cooper pairs\, th
 e waves' effective mass increases dramatically\, to more than 200 times th
 eir bare mass. This mass enhancement is more than 50 times larger than the
  theoretically predicted value for planar solitons. I will present new exp
 eriments that reveal the microscopic nature of the observed solitary waves
 . Our work provides a benchmark for theories of non-equilibrium dynamics o
 f strongly interacting fermions.\n\n[1] Tarik Yefsah\, Ariel T. Sommer\, M
 ark J.H. Ku\, Lawrence W. Cheuk\, Wenjie Ji\, Waseem S. Bakr\, Martin W. Z
 wierlein\, Heavy Solitons in a Fermionic Superfluid\, Nature 499\, 426-430
  (2013)\n
LOCATION:Ryle Seminar (Rutherford 930)
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