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arXiv 2204.09488cond-mat.mes-hallcond-mat.other
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Floquet涡旋态的光导率与轨道磁化

Optical conductivity and orbital magnetization of Floquet vortex states

Iman Ahmadabadi, Hossein Dehghani, Mohammad Hafezi

AI总结:

针对受非零轨道角动量(OAM)光辐照的有质量狄拉克费米子绝缘体中的Floquet涡旋态,研究其轨道磁化与光导率,发现OAM诱导的轨道磁化具线性度、尺寸无关性等特性,还提出基于电导频率峰的涡旋态探测方案。

摘要:

受近期Floquet拓扑绝缘体实验演示的启发,已有若干理论方案提出利用空间或光谱结构化光来产生平带、涡旋态等其他性质。特别是,Kim等人[Phys. Rev. B 105, L081301(2022)]提出在受非零轨道角动量(OAM)光辐照的有质量狄拉克费米子绝缘体中产生涡旋态。本文评估了此类系统的轨道磁化与光导率这两个物理可观测量。研究表明,光的OAM会诱导非零轨道磁化和电流密度;轨道磁化密度随OAM度数线性增加;在特定区域,轨道磁化密度与系统尺寸、宽度及光的拉比频率无关;Floquet理论得出的轨道磁化强度较大,可通过磁强计测量探测。此外,还研究了系统中涡旋态、边缘态和体态等不同态之间电子跃迁的光导率,并基于电导频率峰提出了涡旋态的探测方案。

英文摘要:

Motivated by recent experimental demonstrations of Floquet topological insulators, there have been several theoretical proposals for using structured light, either spatial or spectral, to create other properties such as flat band and vortex states. In particular, the generation of vortex states in a massive Dirac fermion insulator irradiated by light carrying nonzero orbital angular momentum (OAM) has been proposed [Kim et al. Phys. Rev. B 105, L081301(2022)]. Here, we evaluate the orbital magnetization and optical conductivity as physical observables for such a system. We show that the OAM of light induces nonzero orbital magnetization and current density. The orbital magnetization density increases linearly as a function of OAM degree. In certain regimes, we find that orbital magnetization density is independent of the system size, width, and Rabi frequency of light. It is shown that the orbital magnetization arising from our Floquet theory is large and can be probed by magnetometry measurements. Furthermore, we study the optical conductivity for various types of electron transitions between different states such as vortex, edge, and bulk that are present in the system. Based on conductance frequency peaks, a scheme for the detection of vortex states is proposed.

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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