Wednesday, June 12, 2013

1306.2606 (Brandon M. Anderson et al.)

Magnetically generated spin-orbit coupling for ultracold atoms    [PDF]

Brandon M. Anderson, I. B. Spielman, Gediminas Juzeliūnas
We present a new technique for producing two and three dimensional Rashba-type spin-orbit coupling for ultra cold atoms without involving light. The method relies on a sequence of pulsed inhomogeneous magnetic fields imprinting suitable phase gradients on the atoms. For sufficiently short pulse durations, the time-averaged Hamiltonian well approximates the Rashba Hamiltonian. Higher order corrections to the energy spectrum are calculated exactly for spin-1/2 and pertur- batively for higher spins. The pulse sequence does not modify the form of rotationally symmetric atom-atom interactions. Finally, we present a straightforward implementation of this pulse sequence on an atom-chip.
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