MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2013 Nov 27;111(22):225301. doi: 10.1103/PhysRevLett.111.225301. Epub 2013 Nov 25.
We propose a scheme which realizes spin-orbit coupling and the quantum spin Hall effect for neutral atoms in optical lattices without relying on near resonant laser light to couple different spin states. The spin-orbit coupling is created by modifying the motion of atoms in a spin-dependent way by laser recoil. The spin selectivity is provided by Zeeman shifts created with a magnetic field gradient. Alternatively, a quantum spin Hall Hamiltonian can be created by all-optical means using a period-tripling, spin-dependent superlattice.
我们提出了一种方案，该方案在不依赖于近共振激光来耦合不同自旋态的情况下，在光学晶格中实现中性原子的自旋轨道耦合和量子自旋霍尔效应。自旋轨道耦合是通过激光反冲以自旋相关的方式改变原子的运动而产生的。自旋选择性是通过磁场梯度产生的塞曼位移提供的。或者，可以使用周期三倍、自旋相关超晶格通过全光学手段来创建量子自旋霍尔哈密顿量。
