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arXiv · 2401.02269

Dynamical excitations of one-dimensional Fulde-Ferrell pairing Fermi superfluid

Peng Zou·Huaisong Zhao·Feng Yuan·Shi-Guo Peng
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Abstract

We theoretically investigate a one-dimensional Fulde-Ferrell Fermi superfluid at a finite effective Zeeman field $h$, and study entire dynamical excitations related to density perturbation. By calculating the density dynamic structure factor, we find anisotropic dynamical excitations in both collective modes and single-particle excitations. Along the direction of centre-of-mass momentum $p$, there are two obvious gapless collective modes with different speed. The lower collective modes is from the usual gauge symmetry breaking and has a larger speed than the one in the negative direction of $p$. The higher one is due to the direction spontaneous symmetry breaking of centre-of-mass momentum $p$, and separates two kinds of single-particle excitations in the positive $p$ direction. However, this higher mode disappears in the opposite direction of $p$, where two single-particle excitations overlap with each other. These signals of dynamical excitations can do help to distinguish Fulde-Ferrell superfluid from the conventional Bardeen-Cooper-Schrieffer superfluid in the future experiment.

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Peng Zou, Huaisong Zhao, Feng Yuan, Shi-Guo Peng. 2024-01-04. Dynamical excitations of one-dimensional Fulde-Ferrell pairing Fermi superfluid. https://arxiv.org/abs/2401.02269

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