Non-local pair correlations in the 1D Bose gas at finite temperature

Details Non-local pair correlations in the 1D Bose gas at finite temperature Non-local pair correlations in the 1D Bose gas at finite temperature

2008-12-23

arxiv.org/abs/0812.4447v1

Phys. Rev. A 79, 043619 (2009)

Physics

Condensed Matter

Other Condensed Matter

22 pages, 13 figures

Scientific paper

The behavior of the spatial two-particle correlation function is surveyed in detail for a uniform 1D Bose gas with repulsive contact interactions at finite temperatures. Both long-, medium-, and short-range effects are investigated. The results span the entire range of physical regimes, from ideal gas, to strongly interacting, and from zero temperature to high temperature. We present perturbative analytic methods, available at strong and weak coupling, and first-principle numerical results using imaginary time simulations with the gauge-P representation in regimes where perturbative methods are invalid. Nontrivial effects are observed from the interplay of thermally induced bunching behavior versus interaction induced antibunching.

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