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arXiv 2106.04874cond-mat.quant-gascond-mat.mes-hallquant-ph
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非厄米自旋轨道耦合费米子中量子态的手征控制

Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions

Zejian Ren, Dong Liu, Entong Zhao, Chengdong He, Ka Kwan Pak, Jensen Li, Gyu-Boong Jo

摘要:

自旋-轨道耦合是自旋霍尔效应和拓扑绝缘体等量子现象的基本机制。它在孤立的厄米系统中得到了广泛的研究,但对耗散在自旋轨道耦合系统中所起的作用知之甚少。在这里,我们实现了耗散自旋轨道耦合带充满超冷费米子,并观察宇称时间对称性破缺的结果之间的竞争的自旋轨道耦合和耗散。可调耗散,引入状态选择原子损失,使我们能够调整的能隙,并关闭它在临界耗散值,所谓的例外点。在临界点附近,态演化表现出手征响应,这使得我们能够动态地调节自旋轨道耦合和耗散,揭示了当量子态围绕例外点时的拓扑鲁棒的手征自旋转移。这表明我们可以探索具有自旋轨道耦合的非厄米拓扑态。

英文摘要:

Spin-orbit coupling is an essential mechanism underlying quantum phenomena such as the spin Hall effect and topological insulators. It has been widely studied in well-isolated Hermitian systems, but much less is known about the role dissipation plays in spin-orbit-coupled systems. Here, we implement dissipative spin-orbit-coupled bands filled with ultracold fermions, and observe parity-time symmetry breaking as a result of the competition between the spin-orbit coupling and dissipation. Tunable dissipation, introduced by state-selective atom loss, enables us to tune the energy gap and close it at the critical dissipation value, the so-called exceptional point. In the vicinity of the critical point, the state evolution exhibits a chiral response, which enables us to tune the spin-orbit coupling and dissipation dynamically, revealing topologically robust chiral spin transfer when the quantum state encircles the exceptional point. This demonstrates that we can explore non-Hermitian topological states with spin-orbit coupling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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