2009/10/31 by Shiang Fang, Ray‐Kuang Lee, Ray-Kuang Lee +1 · 7 citations
Chemistry · Computer Science · Physics and Astronomy · #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Fraction (chemistry) #Lattice (music) #Momentum (technical analysis) #Optical lattice #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum, superfluid, helium dynamics #Statistical physics #Superfluidity #cond-mat.other #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.82.031601
published in Physical Review A 82(3) (American Physical Society) · 4 pages and 3 figures, the same as the published version
openalex publication_date 2010/09/24 · arxiv created 2010/09/28 · arxiv updated 2010/09/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The quantum fluctuation effects in the time-of-flight (TOF) experiment for a condensate released from an optical-lattice potential is studied within the truncated Wigner approximation. By investigating both the spatial and momentum density distributions, we find that the condensate fraction decreases monotonically in time and hence cannot be measured in the standard TOF image. We then propose a semiquantitative analysis for such dynamical quantum-depletion process. Our study shows a universal algebraic decay of the true condensate fraction, and has a very good agreement with numerical results. We also discuss possible methods to determine the condensate fraction inside the optical lattice, and its implication to the TOF experiments in higher dimensional systems.