Abstract
We present a detailed Monte Carlo study of the many-particle density correlations in an interacting two-dimensional (2D) Bose gas, which are responsible for the recombination and spin relaxation rates in real experiments. We confirm that a effect for local correlators does exist in 2D and can be used for the study of phase transitions. In agreement with a recent experiment [A. I. Safonov et al., Phys. Rev. Lett. 81, 4545 (1998)], the appearance and growth of quasicondensate fluctuations changes local correlations well before the Kosterlitz-Thouless transition point. Even a moderate interaction considerably reduces the amplitude of the effect. This conclusion indicates that the enhancement of the effect observed in the experiment by Safonov et al. cannot be ascribed to finite-interaction effects in a purely 2D system.
- Received 6 November 1998
DOI:https://doi.org/10.1103/PhysRevA.61.043608
©2000 American Physical Society