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Optical valleytronics of impurity states in two-dimensional Dirac materials

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Title
Optical valleytronics of impurity states in two-dimensional Dirac materials
Author(s)
Dogyun Ko; A. V. Morozov; V. M. Kovalev; I. G. Savenko
Publication Date
2021-04
Journal
Physical Review B, v.103, no.16
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.We analyze the valley selection rules for optical transitions from impurity states to the conduction band in two-dimensional Dirac materials, taking a monolayer of MoS2 as an example. We employ the analytical model of a shallow impurity potential which localizes electrons described by a spinor wave function, and, first, find the system eigenstates taking into account the presence of two valleys in the Brillouin zone. Then, we find the spectrum of the absorbance and calculate the photon-drag electric current due to the impurity-band transitions, drawing the general conclusions regarding the valley optical selection rules for the impurity-band optical transitions in gapped Dirac materials.
URI
https://pr.ibs.re.kr/handle/8788114/9905
DOI
10.1103/PhysRevB.103.L161301
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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