TY - JOUR
T1 - Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas
AU - Chang, R.
AU - Bouton, Q.
AU - Cayla, H.
AU - Qu, C.
AU - Aspect, A.
AU - Westbrook, C. I.
AU - Clément, D.
N1 - Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/12/2
Y1 - 2016/12/2
N2 - We report on the single-atom-resolved measurement of the distribution of momenta 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 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.
AB - We report on the single-atom-resolved measurement of the distribution of momenta 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 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.
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U2 - 10.1103/PhysRevLett.117.235303
DO - 10.1103/PhysRevLett.117.235303
M3 - Article
AN - SCOPUS:84999115004
SN - 0031-9007
VL - 117
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 235303
ER -