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	Theory of optical activity in doped systems with application to twisted bilayer graphene
	K. Chang; Z. Zheng; J. E. Sipe and J. L. Cheng
刊名	Physical Review B
	2022
卷号	106期号:24
ISSN号	24699950
DOI	10.1103/PhysRevB.106.245405
英文摘要	We theoretically study the optical activity in a doped system and derive the optical activity tensor from a light wave vector dependent linear optical conductivity. Although the light-matter interaction is introduced through the velocity gauge from a minimal-coupling Hamiltonian, we find that the well-known "false divergences"problem can be avoided in practice if the electronic states are described by a finite-band effective Hamiltonian, such as a few-band tight-binding model. The expression we obtain for the optical activity tensor is in good numerical agreement with a recent theory derived for an undoped topologically trivial gapped system. We apply our theory to the optical activity of a gated twisted bilayer graphene, with a detailed discussion of the dependence of the results on twist angle, chemical potential, gate voltage, and location of rotation center forming the twisted bilayer graphene. 2022 American Physical Society.￥internal-pdf://1983027093/Theory of optical activity in doped systems wi.pdf￥10.1103/PhysRevB.106.245405￥http://dx.doi.org/10.1103/PhysRevB.106.245405
URL标识	查看原文
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/67167]
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	K. Chang,Z. Zheng,J. E. Sipe and J. L. Cheng. Theory of optical activity in doped systems with application to twisted bilayer graphene[J]. Physical Review B,2022,106(24).
APA	K. Chang,Z. Zheng,&J. E. Sipe and J. L. Cheng.(2022).Theory of optical activity in doped systems with application to twisted bilayer graphene.Physical Review B,106(24).
MLA	K. Chang,et al."Theory of optical activity in doped systems with application to twisted bilayer graphene".Physical Review B 106.24(2022).

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