Thursday, September 6, 2012

1209.1053 (Ushnish Ray et al.)

Revealing the Condensate and Non-Condensate Distributions in the

Inhomogeneous Bose-Hubbard Model    [PDF]

Ushnish Ray, David M. Ceperley

We calculate the condensate fraction and the condensate and non-condensate spatial and momentum distribution of the Bose-Hubbard model in a trap. From our results, it is evident that using approximate distributions can lead to erroneous experimental estimates of the condensate. Strong interactions cause the condensate to develop pedestal-like structures around the central peak that can be mistaken as non-condensate atoms. Near the transition temperature, the peak itself can include a significant non-condensate component. Using distributions generated from QMC simulations, experiments can map their measurements for higher accuracy in identifying phase transitions and temperature.
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