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- Phase diagram of a strongly interacting polarized fermi gas in one dimension
- Hu, Hui; Liu, Xia-Ji; Drummond, P. D.
- Based on the integrable Gaudin model and local density approximation, we discuss the ground state of a one-dimensional trapped Fermi gas with imbalanced spin population, for an arbitrary attractive interaction. A phase separation state, with a polarized superfluid core immersed in an unpolarized superfluid shell, emerges below a critical spin polarization. Above it, coexistence of polarized superfluid matter and a fully polarized normal gas is favored. These two exotic states could be realized experimentally in highly elongated atomic traps, and diagnosed by measuring the lowest density compressional mode. We identify the polarized superfluid as having an Fulde-Ferrell-Larkin-Ovchinnikov structure, and predict the resulting mode frequency as a function of the spin polarization.
- Publication type
- Journal article
- Physical Review Letters, Vol. 98, no. 7 (2007), article no. 070403
- Publication year
- FOR Code(s)
- 02 Physical Sciences
- Density measurement; Fermi gas; Fermi liquids; Fulde-Ferrell-Larkin-Ovchinnikov structure; Gaudin model; Mathematical models; Phase diagrams; Phase separation; Polarization; Unpolarized superfluid shell
- American Physical Society
- Publisher URL
- Copyright © 2007 The American Physical Society. Published version of this paper reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed