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강상관계 물질 연구단
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Optical conductivity of black phosphorus with a tunable electronic structure

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Title
Optical conductivity of black phosphorus with a tunable electronic structure
Author(s)
Jiho Jang; Seongjin Ahn; Hongki Min
Publication Date
2019-04
Journal
2D MATERIALS, v.6, no.2, pp.025029 -
Publisher
IOP PUBLISHING LTD
Abstract
© 2019 IOP Publishing Ltd. Black phosphorus (BP) is a two-dimensional layered material composed of phosphorus atoms. Recently, it was demonstrated that external perturbations such as an electric field close the band gap in few-layer BP, and can even induce a band inversion, resulting in an insulator phase with a finite energy gap or a Dirac semimetal phase characterized by two separate Dirac nodes. At the transition between the two phases, a semi-Dirac state appears in which energy disperses linearly along one direction and quadratically along the other. In this work, we study the optical conductivity of few-layer BP using a lattice model and the corresponding continuum model, incorporating the effects of an external electric field and finite temperature. We find that the low-frequency optical conductivity scales a power law that differs depending on the phase, which can be utilized as an experimental signature of few-layer BP in different phases. We also systematically analyze the evolution of the material parameters as the electric field increases, and the consequence on the power-law behavior of the optical conductivity
URI
https://pr.ibs.re.kr/handle/8788114/6532
ISSN
2053-1583
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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