2010/11/30 by St. John, S. T. John, Zoran Hadzibabic +3 · 13 citations
Chemistry · Physics and Astronomy · #Atomic and Subatomic Physics Research #Bose gas #Bose–Einstein condensate #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fraction (chemistry) #Measure (data warehouse) #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Superfluidity #Work (physics) #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.83.023610
published in Physical Review A 83(2) (American Physical Society)
openalex publication_date 2011/02/16 · openalex created_date 2016/06/24 · arxiv created 2017/09/28 · arxiv updated 2017/10/02 · openalex updated_date 2026/08/05
We perform detailed analytical and numerical studies of a recently proposed method for a spectroscopic measurement of the superfluid fraction of an ultracold atomic gas [N. R. Cooper and Z. Hadzibabic, Phys. Rev. Lett. 104, 030401 (2010)]. Previous theoretical work is extended by explicitly including the effects of nonzero temperature and interactions, and assessing the quantitative accuracy of the proposed measurement for a one-component Bose gas. We show that for suitably chosen experimental parameters the method yields an experimentally detectable signal and a sufficiently accurate measurement. This is illustrated by explicitly considering two key examples: First, for a weakly interacting three-dimensional Bose gas it reproduces the expected result that below the critical temperature the superfluid fraction closely follows the condensate fraction. Second, it allows a clear quantitative differentiation of the superfluid and the condensate density in a strongly interacting Bose gas.