论文标题
简化量子气中的密度依赖性自旋轨道耦合
Density Dependent Spin-Orbit Coupling in Degenerate Quantum Gases
论文作者
论文摘要
在这封信中，我们提出了一种方法，以实现超速玻色和费米气体中的一种自旋轨道耦合，其格式和强度取决于原子的密度。我们的方法结合了两光子拉曼的转变和自旋依赖性相互作用的定期调制，这导致了直接拉曼过程和相互作用的辅助拉曼过程，后者取决于原子的密度。这两个过程在旋转摩托车锁定方面具有相反的影响，并相互竞争。随着相互作用调制的增加，系统从直接拉曼过程主导的政权到相互作用辅助拉曼过程主导的政权的交叉经历。对于这种跨界，我们表明，对于玻色子，凝结物动量和冷凝水波函数的手性变化标志，而对于费米子，费米表面失真倒置。我们强调说，在跨界方案中存在着一种新兴的空间反射对称性，可以在玻色和费米气体中普遍表现出来。我们的方法铺平了一种在具有内在动力学的非亚洲仪表场中新现象的方法。
In this letter we propose a method to realize a kind of spin-orbit coupling in ultracold Bose and Fermi gases whose format and strength depend on density of atoms. Our method combines two-photon Raman transition and periodical modulation of spin-dependent interaction, which gives rise to the direct Raman process and the interaction assisted Raman process, and the latter depends on density of atoms. These two processes have opposite effects in term of spin-momentum locking and compete with each other. As the interaction modulation increases, the system undergoes a crossover from the direct Raman process dominated regime to the interaction assisted Raman process dominated regime. For this crossover, we show that for bosons, both the condensate momentum and the chirality of condensate wave function change sign, and for fermions, the Fermi surface distortion is inverted. We highlight that there exists an emergent spatial reflection symmetry in the crossover regime, which can manifest itself universally in both Bose and Fermi gases. Our method paves a way to novel phenomena in a non-abelian gauge field with intrinsic dynamics.
