Dynamics of spin-polarized impurity in ultracold Fermi gas

Abstract

We show that the motion of spin-polarized impurity (ferron) in ultracold atomic gas is characterized by a certain critical velocity which can be traced back to the amount of spin imbalance inside the impurity. We have calculated the effective mass of ferron in two dimensions. We show that the effective mass scales with the surface of the ferron. We discuss the impact of these findings; in particular, we demonstrate that ferrons become unstable in the vicinity of a vortex.

References in corpus (6)

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• Unconventional pairing in few-fermion systems at finite temperature
• Stability of persistent currents in superfluid fermionic rings
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• 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