Journal
PHYSICAL REVIEW A
Volume 100, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.033613
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Funding
- Polish National Science Center (NCN) [UMO-2016/23/B/ST2/01789, UMO2017/26/E/ST3/00428]
- Global Scientific Information and Computing Center, Tokyo Institute of Technology [hp180066]
- Interdisciplinary Centre for Mathematical and Computational Modelling (ICM) of Warsaw University [GA67-14]
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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-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 experiments are discussed.
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