Momentum-resolved observation of thermal and quantum depletion in an interacting Bose gas

Abstract

We report on the single-atom-resolved measurement of the distribution of momenta $\hslash k$ in a weakly interacting Bose gas after a 330 ms time-of-flight. We investigate it for various temperatures and clearly separate two contributions to the depletion of the condensate by their $k$-dependence. The first one is the thermal depletion. The second contribution falls of as $k^{-4}$, and its magnitude increases with the in-trap condensate density as predicted by the Bogoliubov theory at zero temperature. These observations suggest associating it with the quantum depletion. How this contribution can survive the expansion of the released interacting condensate is an intriguing open question.

5 pages, 4 figures and supplementary material

References in corpus (3)

• Verification of universal relations in a strongly interacting Fermi gas
• Fast production of Bose-Einstein condensates of metastable Helium
• Three-dimensional laser cooling at the Doppler limit

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