Spin-orbit-coupled Bose-Einstein condensate in a tilted optical lattice
2010 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 82, no 4, 043620- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
APS , 2010. Vol. 82, no 4, 043620- p.
optical lattice, Bose-Einstein condensate, spin-Hall effect, Bloch oscillations
Physical Sciences Atom and Molecular Physics and Optics Condensed Matter Physics
Research subject Physics; Physics with spec. in Atomic, Molecular and Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-133430DOI: 10.1103/PhysRevA.82.043620ISI: 000283416300009OAI: oai:DiVA.org:uu-133430DiVA: diva2:369451
FunderSwedish Research Council
Additional address (E. Sjöqvist): Centre for Quantum Technologies, NUS, Singapore2010-11-102010-11-102011-10-06Bibliographically approved