Itinerant chiral ferromagnetism in a trapped Rashba spin-orbit-coupled Fermi gas
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We consider a repulsive two-component Fermi gas confined in a two-dimensional isotropic harmonic potential and subject to a large Rashba spin-orbit coupling. The single-particle dispersion can be tailored by the spin-orbit-coupling term, which provides an opportunity to study itinerant ferromagnetism in this system. We show that the interplay among spin-orbit coupling, correlation effect, and mean-field repulsion leads to a competition between ferromagnetic and nonmagnetic phases. The weakly correlated nonmagnetic and the ferromagnetic phases can be well described by the mean-field Hartree-Fock theory, while the transition between the ferromagnetic and a strongly correlated nonmagnetic phase is driven by beyond-mean-field quantum correlation effect. Furthermore, the ferromagnetic phase of this system possesses a chiral current density induced by the Rashba spin-orbit coupling, whose experimental signature is investigated.
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Zhang, Shang-Shun, Liu, Wu-Ming and Pu, Han. "Itinerant chiral ferromagnetism in a trapped Rashba spin-orbit-coupled Fermi gas." Physical Review A, 93, no. 4 (2016) American Physical Society: https://doi.org/10.1103/PhysRevA.93.043602.