论文标题
通过量子旋转系统进行浮动工程和模拟特殊环
Floquet engineering and simulating exceptional rings with a quantum spin system
论文作者
论文摘要
相干辐射形式的时间周期性驾驶为操纵拓扑材料或合成量子物质提供了强大的工具。在本文中，我们提出了一项计划，以实现通过Floquet Engineering在光谱中表现出异常环的非炎热半学的计划。观察到从同心对的环向偶极对的过渡。同心对仅携带一个量化的浆果相，而偶极对也具有相反的Chern数字，还向费米表面的拓扑Lifshitz发出了信号。解决了系统的运输特性，我们发现这种过渡过程伴随着非平凡的霍尔电导率的紧急情况。此外，我们探索了具有量子自旋系统的非富米半法的量子模拟，并通过长期动力学对拓扑的表征进行表征。
Time-periodic driving in the form of coherent radiation provides powerful tool for the manipulation of topological materials or synthetic quantum matter. In this paper we propose a scheme to realize non-Hermitian semimetals exhibiting exceptional rings in the spectra through Floquet engineering. A transition from a concentric pair of the rings to a dipolar pair is observed. The concentric pair carries only a quantized Berry phase while the dipolar pair possesses opposite Chern numbers in addition, signaling a topological Lifshitz transition of the Fermi surface. The transport properties of the system are addressed, and we find that this transition process is accompanied by the emergency of a nontrivial Hall conductivity. Furthermore, we explore the quantum simulation of non-Hermitian semimetals with a quantum spin system and the characterization of the topology via the long-time dynamics.
