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arXiv · 1608.08720

Exact nonequilibrium dynamics of finite-temperature Tonks-Girardeau gases

Y. Y. Atas·D. M. Gangardt·I. Bouchoule·K. V. Kheruntsyan
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Abstract

Describing finite-temperature nonequilibrium dynamics of interacting many-particle systems is a notoriously challenging problem in quantum many-body physics. Here we provide an exact solution to this problem for a system of strongly interacting bosons in one dimension in the Tonks-Girardeau regime of infinitely strong repulsive interactions. Using the Fredholm determinant approach and the Bose-Fermi mapping we show how the problem can be reduced to a single-particle basis, wherein the finite-temperature effects enter the solution via an effective "dressing" of the single-particle wavefunctions by the Fermi-Dirac occupation factors. We demonstrate the utility of our approach and its computational efficiency in two nontrivial out-of-equilibrium scenarios: collective breathing mode oscillations in a harmonic trap and collisional dynamics in the Newton's cradle setting involving real-time evolution in a periodic Bragg potential.

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Y. Y. Atas, D. M. Gangardt, I. Bouchoule, K. V. Kheruntsyan. 2017-04-30. Exact nonequilibrium dynamics of finite-temperature Tonks-Girardeau gases. https://doi.org/10.1103/physreva.95.043622

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