Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

doi:10.1088/1674-1056/ac2b94

中国物理B ›› 2022, Vol. 31 ›› Issue (4): 47301-047301.doi: 10.1088/1674-1056/ac2b94

Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

Xingfei Zhou(周兴飞)^1,†, Ziying Wu(吴子瀛)², Yuchen Bai(白宇晨)¹, Qicheng Wang(王起程)¹, Zhentao Zhu(朱震涛)¹, Wei Yan(闫巍)^1,‡, and Yafang Xu(许亚芳)^2,§

1 New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
2 College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

收稿日期:2021-08-23 修回日期:2021-09-15 接受日期:2021-09-30 出版日期:2022-03-16 发布日期:2022-03-16
通讯作者: Xingfei Zhou, Wei Yan, Yafang Xu E-mail:zxf@njupt.edu.cn;yanwei@njupt.edu.cn;yfxu@yzu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11804167, 11804291, and 11904175), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20180739, BK20180740, and BK20180890), the Innovation Research Project of Jiangsu Province, China (Grant No. CZ0070619002), NJUPT-SF (Grant Nos. NY218128 and NY218135), and NJUPT-STITP (Grant No. XYB2020301).

Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

Xingfei Zhou(周兴飞)^1,†, Ziying Wu(吴子瀛)², Yuchen Bai(白宇晨)¹, Qicheng Wang(王起程)¹, Zhentao Zhu(朱震涛)¹, Wei Yan(闫巍)^1,‡, and Yafang Xu(许亚芳)^2,§

1 New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
2 College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

Received:2021-08-23 Revised:2021-09-15 Accepted:2021-09-30 Online:2022-03-16 Published:2022-03-16
Contact: Xingfei Zhou, Wei Yan, Yafang Xu E-mail:zxf@njupt.edu.cn;yanwei@njupt.edu.cn;yfxu@yzu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11804167, 11804291, and 11904175), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK20180739, BK20180740, and BK20180890), the Innovation Research Project of Jiangsu Province, China (Grant No. CZ0070619002), NJUPT-SF (Grant Nos. NY218128 and NY218135), and NJUPT-STITP (Grant No. XYB2020301).

摘要/Abstract

摘要： We investigate the electron retroreflection and the Klein tunneling across a graphene-based n-p-n junction irradiated by linearly polarized off-resonant light with the polarization along the x direction. The linearly polarized off-resonant light modifies the band structure of graphene, which leads to the anisotropy of band structure. By adjusting the linearly polarized light and the direction of n-p-n junction simultaneously, the electron retroreflection appears and the anomalous Klein tunneling, the perfect transmission at a nonzero incident angle regardless of the width and height of potential barrier, happens, which arises from the fact that the light-induced anisotropic band structure changes the relation of wavevector and velocity of electron. Our finding provides an alternative and flexible method to modulate electron retroreflection and Klein tunneling.

关键词: linearly polarized light, electron retroreflection, Klein tunneling, graphene

Abstract: We investigate the electron retroreflection and the Klein tunneling across a graphene-based n-p-n junction irradiated by linearly polarized off-resonant light with the polarization along the x direction. The linearly polarized off-resonant light modifies the band structure of graphene, which leads to the anisotropy of band structure. By adjusting the linearly polarized light and the direction of n-p-n junction simultaneously, the electron retroreflection appears and the anomalous Klein tunneling, the perfect transmission at a nonzero incident angle regardless of the width and height of potential barrier, happens, which arises from the fact that the light-induced anisotropic band structure changes the relation of wavevector and velocity of electron. Our finding provides an alternative and flexible method to modulate electron retroreflection and Klein tunneling.

Key words: linearly polarized light, electron retroreflection, Klein tunneling, graphene

中图分类号: (Electronic structure of graphene)

73.22.Pr

73.20.At (Surface states, band structure, electron density of states) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Xingfei Zhou(周兴飞), Ziying Wu(吴子瀛), Yuchen Bai(白宇晨), Qicheng Wang(王起程), Zhentao Zhu(朱震涛), Wei Yan(闫巍), and Yafang Xu(许亚芳). Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction[J]. 中国物理B, 2022, 31(4): 47301-047301.

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Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

Light-modulated electron retroreflection and Klein tunneling in a graphene-based n-p-n junction

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