The virial expansion of attractively interacting Fermi gases in 1D, 2D, and 3D, up to fifth order

Abstract

The virial expansion characterizes the high-temperature approach to the quantum-classical crossover in any quantum many-body system. Here, we calculate the virial coefficients up to the fifth-order of Fermi gases in 1D, 2D, and 3D, with attractive contact interactions, as relevant for a variety of applications in atomic and nuclear physics. To that end, we discretize the imaginary-time direction and calculate the relevant canonical partition functions. In coarse discretizations, we obtain analytic results featuring relationships between the interaction-induced changes $\Delta b_3$, $\Delta b_4$, and $\Delta b_5$ as functions of $\Delta b_2$, the latter being exactly known in many cases by virtue of the Beth-Uhlenbeck formula. Using automated-algebra methods, we push our calculations to progressively finer discretizations and extrapolate to the continuous-time limit. We find excellent agreement for $\Delta b_3$ with previous calculations in all dimensions and we formulate predictions for $\Delta b_4$ and $\Delta b_5$ in 1D and 2D. We also provide, for a range of couplings,the subspace contributions $\Delta b_{31}$, $\Delta b_{22}$, $\Delta b_{41}$, and $\Delta b_{32}$, which determine the equation of state and static response of polarized systems at high temperature. As a performance check, we compare the density equation of state and Tan contact with quantum Monte Carlo calculations, diagrammatic approaches, and experimental data where available. Finally, we apply Padé and Padé-Borel resummation methods to extend the usefulness of the virial coefficients to approach and in some cases go beyond the unit-fugacity point.

arXiv comment15 pages, 14 figures; greatly expanded version including subspace contributions, extrapolations to the continuous-time limit, and applications in 1D, 2D, and 3D using resummation techniques

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Cited by in corpus (5)

• Pairing and the spin susceptibility of the polarized unitary Fermi gas in the normal phase
• Fourth- and fifth-order virial expansion of harmonically trapped fermions at unitarity
• Quench Dynamics of Thermal Bose Gases Across Wide and Narrow Feshbach
• Toward an automated-algebra framework for high orders in the virial expansion of quantum matter
• The thermal index of neutron-star matter in the virial approximation