Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.260402
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Funding
- National Science Foundation [PHY-1508300]
- ARO-MURI Non-equilibrium Many-body Dynamics Grant [W9111NF-14-1-0003]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1508300] Funding Source: National Science Foundation
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We characterize the collective modes of a soliton train in a quasi-one-dimensional Fermi superfluid, using a mean-field formalism. In addition to the expected Goldstone and Higgs modes, we find novel long-lived gapped modes associated with oscillations of the soliton cores. The soliton train has an instability that depends strongly on the interaction strength and the spacing of solitons. It can be stabilized by filling each soliton with an unpaired fermion, thus forming a commensurate Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We find that such a state is always dynamically stable, which paves the way for realizing long-lived FFLO states in experiments via phase imprinting.
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