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

• 作者: Xingfei Zhou Ziying Wu Yuchen Bai Qicheng Wang Zhentao Zhu Wei Yan Yafang Xu
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAG-NETIC, AND OPTICAL PROPERTIES
• 页码范围: 711-715
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac2b94

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.