Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas

Year: 2016

Authors: Chang R., Bouton Q., Cayla H., Qu C., Aspect A., Westbrook CI., Clement D.

Autors Affiliation: Univ Paris Sud, Lab Charles Fabry, Inst Opt, CNRS, 2 Ave Augustin Fresnel, F-91127 Palaiseau, France;‎ Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy

Abstract: We report on the single-atom-resolved measurement of the distribution of momenta (h) over bark 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 off 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.


Volume: 117 (23)      Pages from: 235303-1  to: 235303-5

DOI: 10.1103/PhysRevLett.117.235303

Citations: 48
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