Exact spectral function of the Tonks-Girardeau gas at finite temperature
arXiv:2208.13132 · doi:10.1103/PhysRevA.106.053306
Abstract
We report on the derivation of determinant representations for the Green's functions and spectral function of the trapped Tonks-Girardeau gas on the lattice and in the continuum. Our results are valid for any type of statistics of the constituent particles, at zero and finite temperature and arbitrary confining potentials, including nonequilibrium scenarios induced by sudden changes of the external potential. In addition, they are also extremely efficient and easy to implement numerically with the main computational effort being represented by the calculation of partial overlaps of the dynamically evolved single particle wavefunctions. In the lattice case we show that the spectral function of a system with a strong harmonic potential presents only two singular lines compared with three singular lines in the case of a homogeneous system.
arXiv comment20 pages, 2 figures, RevTeX 4.2, Eq. 91 corrected
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