2014/05/31 by Myung-Kyun Kang, Uwe R. Fischer
Physics and Astronomy · #Atomic physics #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Fermi Gamma-ray Space Telescope #Fermi gas #Fragmentation (computing) #Physics #Quantum Mechanics and Applications #Quantum mechanics #Quantum, superfluid, helium dynamics #Trap (plumbing) #Uncorrelated #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.140404
published as Phys. Rev. Lett. 113, 140404 (2014) · 5+6 pages of RevTex4-1, 2+2 figures
openalex publication_date 2014/09/29 · arxiv created 2014/09/30 · arxiv updated 2014/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider ultracold bosonic atoms in a single trap in the Thomas-Fermi regime, forming many-body states corresponding to stable macroscopically fragmented two-mode condensates. It is demonstrated that upon free expansion of the gas, the spatial dependence of the density-density correlations at late times provides a unique signature of fragmentation. This hallmark of fragmented condensate many-body states in a single trap is due to the fact that the time of flight modifies the correlation signal such that two opposite points in the expanding cloud become uncorrelated, in distinction to a nonfragmented Bose-Einstein condensate, where they remain correlated.