Effect of Induced Spin-Orbit Coupling for Atoms via Laser Fields
arXiv:0808.4137 · doi:10.1103/PhysRevLett.102.046402
Abstract
We propose an experimental scheme to study spin-orbit coupling effects in a of two-dimensional (2D) Fermi atomic gas cloud by coupling its internal electronic states (pseudospins) to radiation in a delta configuration. The induced spin-orbit coupling can be of the Dresselhaus and Rashba type with and without a Zeeman term. We show that the optically induced spin-orbit coupling can lead to a spin-dependent effective mass under appropriate condition, with one of them able to be tuned between positive and negative effective mass. As a direct observable we show that in the expansion dynamics of the atomic cloud the initial atomic cloud splits into two clouds for the positive effective mass case regime, and into four clouds for the negative effective mass regime.
4 pages, 3 figures
References in corpus (8)
- Dissipationless Quantum Spin Current at Room Temperature
- Non-Abelian gauge potentials for ultra-cold atoms with degenerate dark states
- Spin-orbit coupled Bose-Einstein condensates
- Spin Hall effects for cold atoms in a light induced gauge potential
- Observing Zitterbewegung in Ultracold Atoms
- Generalized Stern-Gerlach Effect for Chiral Molecules
- Non-equilibrium spin dynamics in a trapped Fermi gas with effective spin-orbit interaction
- Spin-orbit coupling and Berry phase with ultracold atoms in 2D optical lattices