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SUMMARY:One-dimensional boson flow between weakly couple reservoirs - Prof
 essor Igor Lerner\, University of Birmingham
DTSTART:20141009T131500Z
DTEND:20141009T141500Z
UID:TALK53923@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:We study a flow of ultracold bosonic atoms through a one-dimen
 sional channel that connects two macroscopic three-dimensional reservoirs 
 of Bose-condensed atoms via weak links implemented as potential barriers b
 etween each of the reservoirs and the channel. We consider reservoirs at e
 qual chemical potentials so that a superflow of the quasicondensate throug
 h the channel is driven purely by a phase difference 2Φ imprinted between
  the reservoirs. We find that the superflow never has the standard Josephs
 on form ∼ sin 2Φ. Instead\, the superflow discontinuously flips directi
 on at 2Φ 1⁄4 `π and has metastable branches. We show that these featur
 es are robust and not smeared by fluctuations or phase slips. We describe 
 a possible experimental setup for observing these phenomena.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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