Collective Modes of a Soliton Train in a Fermi Superfluid.

Authors
Mueller, Erich J 

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Article
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Abstract

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.

Publication Date
2017-06-30
Online Publication Date
2017-06-29
Acceptance Date
2017-04-27
Keywords
cond-mat.quant-gas, cond-mat.quant-gas, nlin.PS
Journal Title
Phys Rev Lett
Journal ISSN
0031-9007
1079-7114
Volume Title
118
Publisher
American Physical Society (APS)
Rights
Publisher's own licence