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Finite temperature contact for SU(2) fermions trapped in a 1D harmonic confinement

We calculate the finite-temperature Tan's contact for N SU(2) fermions, characterized by repulsive contact interaction, trapped in a 1D harmonic confinement within a local density approximation on top of a thermodynamic Bethe Ansatz. The Tan's contact for such a system, as in the homogeneous case, displays a minimum at a very low temperature. By means of an exact canonical ensemble calculation for two fermions, we provide an explicit formula for the contact at very low temperatures that reveals that the minimum is due to the mixing of states with different exchange symmetries. In the unitary regime, this symmetry blending corresponds to a maximal entanglement entropy.

preprint2020arXivOpen access
P. CapuzziP. Vignolo
cond-mat.quant-gasquant-ph
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P. CapuzziP. Vignolo

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