Bloch Oscillations in Optical and Zeeman Lattices in the Presence of Spin-Orbit Coupling
arXiv:1610.04716 · doi:10.1103/PhysRevLett.117.215301
Abstract
We address Bloch oscillations of a spin-orbit coupled atom in periodic potentials of two types: Optical and Zeeman lattices. We show that in optical lattices the spin-orbit coupling allows controlling the direction of atomic motion and may lead to complete suppression of the oscillations at specific values of the coupling strength. In Zeeman lattices the energy bands are found to cross each other at the boundaries of the Brillouin zone, resulting in period-doubling of the oscillations. In all cases, the oscillations are accompanied by rotation of the pseudo-spin, with a dynamics that is determined by the strength of the spin-orbit coupling. The predicted effects are discussed also in terms of a Wannier-Stark ladder, which in optical lattices consist of two mutually-shifted equidistant sub-ladders.
arXiv comment7 pages (together with the Supplemental Material), 5 figures; to appear in Phys. Rev. Lett; typo fixed
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