Off-diagonal long-range order in a harmonically confined two-dimensional Bose gas
van Zyl, Brandon P.
Original · EN
We investigate the presence of off-diagonal long-range order in a harmonically confined two-dimensional Bose gas. In the noninteracting case, an analytical calculation of the the finite-temperature one-particle density martix provides an exact description of the spatial correlations known to be associated with the existence of a Bose-Einstein condensate below the transition temperature T⁽⁰⁾c. We treat the effects of repulsive interactions within the semiclassical Hartree-Fock-Bogliubov approximation and find that even though the system remains in the same uncondensed phase for all T ≥ 0, there appears to be a revival of off-diagonal long-range order for temperatures T < T⁽⁰⁾c. We suggest that this reentrant order is related to a phase transition in the system which is not the BEC state.
English translation
This paper has no Arabic translation yet. Be the first: it takes a few seconds, and the result is stored for every future reader.