Collective Modes of a Soliton Train in a Fermi Superfluid.
Dutta, Shovan https://orcid.org/0000-0002-3534-6920
Mueller, Erich J
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.
Online Publication Date
cond-mat.quant-gas, cond-mat.quant-gas, nlin.PS
Phys Rev Lett
American Physical Society (APS)
Publisher's own licence