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SUMMARY:Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta 
 - Ulrich Schneider (University of Cambridge\; Ludwig-Maximilians-Universit
 ät München\; Max-Planck-Institut für Quantenoptik )
DTSTART:20160112T100000Z
DTEND:20160112T110000Z
UID:TALK64620@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:We experimentally study the expansion of initially localized u
 ltracold bosons  in homogeneous optical lattices in real and momentum spac
 e and find that both  dimensionality and interaction strength crucially in
 fluence these  out-of-equilibrium dynamics. While the atoms expand ballist
 ically in all  integrable limits\, deviations from these limits dramatical
 ly suppress the  expansion and lead to the appearance of almost bimodal re
 al-space density  distributions. For strongly interacting bosons\, we obse
 rve a dimensional  crossover of the dynamics from ballistic in the one-dim
 ensional hard-core case  to diffusive in two dimensions\, as well as a sim
 ilar crossover when higher  occupancies are introduced into the system. St
 udying the same expansion in  momentum space\, we observe the onset of qua
 sicondensation of expanding hard-core  bosons at finite momenta in a high 
 energy far-from-equilibrium situation\, even  though long-range order is u
 sually associated with low-temperature equilibrium  situations. In particu
 lar\, we observe the emergence of peaks at finite momenta  that correspond
 s to the spontaneous formation of coherence with a phase order  that diffe
 rs from the ground-state order. <br> <br>Related Links <ul> <li><a target=
 "_blank" rel="nofollow">http://www.manybody.phy.cam.ac.uk/</a>  - Group We
 bsite&nbsp\;</li></ul>
LOCATION:Seminar Room 1\, Newton Institute
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