Joint Quantum Institute, University of Maryland, College Park, Maryland 20742-4111, USA and National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Phys Rev Lett. 2013 Sep 20;111(12):125301. doi: 10.1103/PhysRevLett.111.125301. Epub 2013 Sep 18.
We present a new technique for producing two- and three-dimensional Rashba-type spin-orbit couplings for ultracold 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 perturbatively 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.
我们提出了一种新的技术，用于在不涉及光的情况下产生二维和三维的 Rashba 型自旋轨道耦合，用于超冷原子。该方法依赖于一系列脉冲非均匀磁场，在原子上印上合适的相位梯度。对于足够短的脉冲持续时间，时间平均哈密顿量很好地近似 Rashba 哈密顿量。对于自旋为 1/2 的情况，我们精确地计算了能量谱的高阶修正，对于更高的自旋则进行了微扰计算。该脉冲序列不会改变旋转对称的原子间相互作用的形式。最后，我们在原子芯片上提出了这种脉冲序列的一种简单实现方式。
