2014/08/01 by Ke-Ji Chen, Jingkun Wang, Wei Yi +1
Materials Science · Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensation #Electronic and Structural Properties of Oxides #Lattice (music) #Optical lattice #Particle (ecology) #Phase (matter) #Quantum many-body systems #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1140/epjd/e2014-50340-y
published as Eur. Phys. J. D 68, 232 (2014) · 5 pages, 3 figures
openalex publication_date 2014/08/01 · arxiv created 2014/09/05 · arxiv updated 2014/09/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We discuss typical experimental signatures for the Bose-Einstein condensation (BEC) of an ultracold Bose gas in an inhomogeneous optical lattice at finite temperature. Applying the Hartree-Fock-Bogoliubov-Popov formalism, we calculate quantities such as the momentum-space density distribution, visibility and peak width as the system is tuned through the superfluid to normal phase transition. Different from previous studies, we consider systems with fixed total particle number, which is of direct experimental relevance. We show that the onset of BEC is accompanied by sharp features in all these signatures, which can be probed via typical time-of-flight imaging techniques. In particular, we find a two-platform structure in the peak width across the phase transition. We show that the onset of condensation is related to the emergence of the higher platform, which can be used as an effective experimental signature.