Disordered structures in ultracold spin-imbalanced Fermi gas

Abstract

We investigate properties of spin-imbalanced ultracold Fermi gas in a large range of spin polarizations at low temperatures. We present results of microscopic calculations based on mean-field and density functional theory approaches, with no symmetry constraints. At low polarization values we predict the structure of the system as consisting of several spin-polarized droplets. As the polarization increases, the system self-organizes into a disordered structures similar to liquid crystals, and energetically they can compete with ordered structures such as grid-like domain walls. At higher polarizations the system starts to develop regularities that, in principle, can be called supersolid, where periodic density modulation and pairing correlations coexist. The robustness of the results has been checked with respect to temperature effects, dimensionality, and the presence of a trapping potential. Dynamical stability has also been investigated.

Ancillary files contain reproducibility packs of numerical calculations

References in corpus (16)

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• Theory of ultracold Fermi gases
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• Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas

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• Stability of persistent currents in superfluid fermionic rings
• Hierarchy of pairing in imbalanced three-component one-dimensional Fermi gas
• Finding the stable mechanism of ring solitons in two-dimensional Fermi superfluids
• Phase transitions in the inner crust of neutron stars within the superfluid band theory: Competition between ${}^1{\text{S}}_0$ pairing and spin polarization under finite temperature and magnetic field
• Quantum vortex dipole as a probe of the normal component distribution
• Local Quantum Cooling for Large Fermi Systems with Pairing