Unitary polarized Fermi gases

TL;DR

This paper explores the properties of unitary polarized Fermi gases, emphasizing their universal behavior at infinite scattering length, and clarifies how strong interactions influence their macroscopic characteristics.

Contribution

It demonstrates that the macroscopic properties of polarized Fermi gases at unitarity can be understood through their universal behavior, especially under strong interactions.

Findings

Universal behavior characterizes the regime of infinite scattering length.

Macroscopic properties are quantitatively understood in the strong interaction regime.

Clarifies the role of polarization mismatch in fermionic superfluids.

Abstract

Although recent theoretical and experimental progress have considerably clarified pairing mechanisms in spin 1/2 fermionic superfluid with equally populated internal states, many open questions remain when the two spin populations are mismatched. We show here that, taking advantage of the universal behavior characterizing the regime of infinite scattering length, the macroscopic properties of these systems can be simply and quantitatively understood in the regime of strong interactions.