Spin-polarized droplets in the unitary Fermi gas

Abstract

We demonstrate the existence of a new type of spatially localized excitations in the unitary Fermi gas: spin polarized droplets with a peculiar internal structure involving the abrupt change of the pairing phase at the surface of the droplet. It resembles the structure of the Josephson-$\pi$ junction occurring when a slice of a ferromagnet is sandwiched between two superconductors. The stability of the impurity is enhanced by the mutual interplay between the polarization effects and the pairing field, resulting in an exceptionally long-lived state. The prospects for its realization in experiment are discussed.

arXiv commentManuscript with included Supplementary Material. Published version. Accompanying movies are available at http://wlazlowski.fizyka.pw.edu.pl/supplement/2/

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• Ring solitons and soliton sacks in imbalanced fermionic systems
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• Dissipation Mechanisms in Fermionic Josephson Junction
• Exotic Superfluid Phases in Spin Polarized Systems on Optical Lattices
• Exploring emergent heterogeneous phases in strongly repulsive Fermi gases
• Dynamics of spin-polarized impurity in ultracold Fermi gas
• Disordered structures in ultracold spin-imbalanced Fermi gas
• Generation and decay of Higgs mode in a strongly interacting Fermi gas
• Collisional dynamics of polaronic clouds immersed in a Fermi sea
• Quantum Monte Carlo-based density functional for one-dimensional Bose-Bose mixtures
• Time-dependent nuclear energy-density functional theory toolkit for neutron star crust: Dynamics of a nucleus in a neutron superfluid
• Unconventional pairing in few-fermion systems at finite temperature
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Stability of persistent currents in superfluid fermionic rings
• Exploring ${}^3{P}_0$ Superfluid in Dilute Spin-Polarized Neutron Matter
• Extracting non-local inter-polaron interactions from collisional dynamics
• Examining the justification for the introduction of a fermion localization function
• Repulsive Fermi and Bose Polarons in Quantum Gases
• Finding the stable mechanism of ring solitons in two-dimensional Fermi superfluids
• Vortex lattice in spin-imbalanced unitary Fermi gas
• Local Quantum Cooling for Large Fermi Systems with Pairing
• 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