Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.173001
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Funding
- DFG [BR 4005/4-1]
- HIC for FAIR within the LOEWE program of the State of Hesse
- National Science Foundation Graduate Research Fellowship Program [DGE1144081]
- National Science Foundation Computational Physics Program [PHY1452635]
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We study in a nonperturbative fashion the thermodynamics of a unitary Fermi gas over a wide range of temperatures and spin polarizations. To this end, we use the complex Langevin method, a first principles approach for strongly coupled systems. Specifically, we show results for the density equation of state, the magnetization, and the magnetic susceptibility. At zero polarization, our results agree well with state-of-the-art results for the density equation of state and with experimental data. At finite polarization and low fugacity, our results are in excellent agreement with the third-order virial expansion. In the fully quantum mechanical regime close to the balanced limit, the critical temperature for superfluidity appears to depend only weakly on the spin polarization.
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