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Abstract: Quantum virial expansion provides an ideal tool to investigate thehigh-temperature properties of a strongly correlated Fermi gas. Here, weconstruct the virial expansion in the presence of spin population imbalance. Upto the third order, we calculate the high-temperature free energy of a unitaryFermi gas as a function of spin imbalance, with infinitely large, attractive orrepulsive interactions. In the latter repulsive case, we show that there is noitinerant ferromagnetism when quantum virial expansion is applicable. Wetherefore estimate an upper bound for the ferromagnetic transition temperature$T {c}$. For a harmonically trapped Fermi gas at unitarity, we find that$T {c} {uppper}


Autor: Xia-Ji Liu, Hui Hu

Fuente: https://arxiv.org/







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