Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption

doi:10.1088/1674-1056/27/4/047303

中国物理B ›› 2018, Vol. 27 ›› Issue (4): 47303-047303.doi: 10.1088/1674-1056/27/4/047303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption

Shi He(何诗), Mou Yang(杨谋), Rui-Qiang Wang(王瑞强)

Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China

收稿日期:2017-12-05 修回日期:2018-01-16 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: Mou Yang E-mail:yang.mou@hotmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774100 and 11474106).

Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption

Shi He(何诗), Mou Yang(杨谋), Rui-Qiang Wang(王瑞强)

Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China

Received:2017-12-05 Revised:2018-01-16 Online:2018-04-05 Published:2018-04-05
Contact: Mou Yang E-mail:yang.mou@hotmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774100 and 11474106).

摘要/Abstract

摘要：

Strain is a powerful tool to engineer the band structure of bilayer phosphorene. The band gap can be decreased by vertical tensile strain or in-plane compressive strain. At a critical strain, the gap is closed and the bilayer phosphorene is turn to be a semi-Dirac semimetal material. If the strain is stronger than the criterion, a band-inversion occurs and it re-happens when the strain is larger than another certain value. For the zigzag bilayer phosphorene ribbon, there are two edge band dispersions and each dispersion curve represents two degenerate edge bands. When the first band-inversion happens, one of the edge band dispersion disappears between the band-cross points while the other survives, and the latter will be eliminated between another pair of band-cross points of the second band-inversion. The optical absorption of bilayer phosphorene is highly polarized along armchair direction. When the strain is turn on, the optical absorption edge changes. The absorption rate for armchair polarized light is decreased by gap shrinking, while that for zigzag polarized light increases. The band-touch and band-inversion respectively result in the sublinear and linear of absorption curve versus light frequency in low frequency limit.

关键词: phosphorene, electronic structure, optical absorption, strain

Abstract:

Key words: phosphorene, electronic structure, optical absorption, strain

中图分类号: (Electronic structure of nanoscale materials and related systems)

73.22.-f

73.23.-b (Electronic transport in mesoscopic systems) 78.20.-e (Optical properties of bulk materials and thin films)

何诗, 杨谋, 王瑞强. Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption[J]. 中国物理B, 2018, 27(4): 47303-047303.

Shi He(何诗), Mou Yang(杨谋), Rui-Qiang Wang(王瑞强). Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption[J]. Chin. Phys. B, 2018, 27(4): 47303-047303.

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Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption

Double band-inversions of bilayer phosphorene under strain and their effects on optical absorption

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