Spin-orbit-coupled Bose-Einstein condensate in a tilted optical lattice

Jonas Larson, Jani-Petri Martikainen, Anssi Collin, Erik Sjöqvist

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Bloch oscillations appear for a particle in a weakly tilted periodic potential. The intrinsic spin Hall effect is an outcome of a spin-orbit coupling. We demonstrate that both of these phenomena can be realized simultaneously in a gas of weakly interacting ultracold atoms exposed to a tilted optical lattice and to a set of spatially dependent light fields inducing an effective spin-orbit coupling. It is found that both the spin Hall and the Bloch oscillation effects may coexist, showing, however, a strong correlation between the two. These correlations are manifested as a transverse spin current oscillating in-phase with the Bloch oscillations. On top of the oscillations originating from the periodicity of the model, a trembling motion is found which is believed to be atomic Zitterbewegung. It is argued that the damping of these Zitterbewegung oscillations may to a large extent be prevented in the present setup considering a periodic optical lattice potential.
Original languageEnglish
Article number043620
JournalPhysical Review A
Volume82
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

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