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      Itinerant ferromagnetism in repulsively interacting spin-orbit coupled Fermi gas

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          Abstract

          We investigate the itinerant ferromagnetism of repulsively interacting Fermi gases with spin-orbit coupling (SOC). We find that the spin-orbit coupling provides a new and efficient mechanism to realize the itinerant ferromagnetism (FM) which is a long sought state in material science at much weaker repulsive interactions. We classify the symmetries and symmetry breaking of the SOC Hamiltoniian and find their exact constraints on the density-spin response functions. In the para-magnet side, the SOC leads to the splitting of two transverse modes. In the FM side, the Fermi surfaces acquire a finite momentum and also experience a topological Lifshitz transition, the symmetry breaking leads to one gapped transverse pseudo-Goldstone mode instead of one gapless Goldstone mode. Various experimental probes are discussed.

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          Author and article information

          Journal
          2014-03-27
          2015-01-09
          1403.7031

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          cond-mat.quant-gas cond-mat.str-el

          Quantum gases & Cold atoms

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