Collective modes of a soliton train in a Fermi superfluid
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.
Keywords
Cite
@article{arxiv.1612.04845,
title = {Collective modes of a soliton train in a Fermi superfluid},
author = {Shovan Dutta and Erich J. Mueller},
journal= {arXiv preprint arXiv:1612.04845},
year = {2017}
}
Comments
Published version: 4-page article + references + supplement. Supplement contains two new sections on (i) protocol to engineer soliton train states and (ii) convention for Bogoliubov operators. Results and conclusions unchanged