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Universal phase diagram and scaling functions of imbalanced Fermi gases

Authors :
Frank, Bernhard
Lang, Johannes
Zwerger, Wilhelm
Source :
JETP 127(5), 812 (2018)
Publication Year :
2018

Abstract

We discuss the phase diagram and the universal scaling functions of attractive Fermi gases at finite imbalance. The existence of a quantum multicritical point for the unitary gas at vanishing chemical potential $\mu$ and effective magnetic field $h$, first discussed by Nikoli\'{c} and Sachdev, gives rise to three different phase diagrams, depending on whether the inverse scattering length $1/a$ is negative, positive or zero. Within a Luttinger-Ward formalism, the phase diagram and pressure of the unitary gas is calculated as a function of the dimensionless scaling variables $T/\mu$ and $h/\mu$. The results indicate that beyond the Clogston-Chandrasekhar limit at $(h/\mu)_c\simeq 1.09$, the unitary gas exhibits an inhomogeneous superfluid phase with FFLO order that can reach critical temperatures near unitarity of $\simeq 0.03\, T_F$.<br />Comment: 15 pages, 8 figures, JETP style, text overlap with arXiv:1608.00457, v2: published version

Details

Database :
arXiv
Journal :
JETP 127(5), 812 (2018)
Publication Type :
Report
Accession number :
edsarx.1804.03035
Document Type :
Working Paper
Full Text :
https://doi.org/10.1134/S1063776118110031