Spin-polarized droplets in the unitary Fermi gas
ABSTRACT
We demonstrate the existence of a type of spatially localized excitations in the unitary Fermi gas: spin-polarized droplets with a peculiar internal structure involving an abrupt change in the pairing phase at the surface of the droplet. It resembles the structure of the Josephson-π 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 experiments are discussed.
Prof. Piotr Magierski, mgr Buğra Tüzemen and prof. Gabriel Wlazłowski published new paper in Physical Review Letters A
What is ferron?
It is localized excitation in the unitary Fermi gas. It looks like a droplet 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-π junction occurring when a slice of a ferromagnet is sandwiched between two superconductors. The polarized droplet is stabilized by the mutual interplay between the polarization effects and the pairing field structure resulting in an exceptionally long-lived state.
The left and right parts of the figure present the polarization p(r) and the pairing field ∆(r) distributions respectively of the ferron. The characteristic feature is the presence of the nodal surface of the pairing field where the pairing changes its sign and it also corresponds to the surface where polarization reaches maximum.
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.100.033613
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