Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generation
Abstract
We study the Bloch oscillation dynamics of a spin-orbit-coupled cold atomic gas trapped inside a one-dimensioanl optical lattice. The eigenspectra of the system is identified as two interpenetrating Wannier-Stark ladder. Based on that, we carefully analyzed the Bloch oscillation dynamics and found out that intraladder coupling between neighboring rungs of Wannier-Stark ladder give rise to ordinary Bloch oscillation while interladder coupling lead to small amplitude high frequency oscillation superimposed on it. Specifically spin-orbit interaction breaks Galilean invariance, which can be reflected by out-of-phase oscillation of the two spin components in the accelerated frame. The possibility of generating spin current in this system are also explored.
Keywords
Cite
@article{arxiv.1902.00634,
title = {Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generation},
author = {Wei Ji and Keye Zhang and Weiping Zhang and Lu Zhou},
journal= {arXiv preprint arXiv:1902.00634},
year = {2019}
}
Comments
8 pages, 6 figures