Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS2-based p-n junction

doi:10.1088/1674-1056/ac46bf

中国物理B ›› 2022, Vol. 31 ›› Issue (7): 77301-077301.doi: 10.1088/1674-1056/ac46bf

Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction

Fenghua Qi(戚凤华)¹ and Xingfei Zhou(周兴飞)^2,†

1 School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China;
2 New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

收稿日期:2021-11-08 修回日期:2021-12-24 接受日期:2021-12-29 出版日期:2022-06-09 发布日期:2022-06-13
通讯作者: Xingfei Zhou E-mail:zxf@njupt.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12104232, 11805103, and 11804167), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20190137 and BK20180739), the Innovation Research Project of Jiangsu Province (Grant No. CZ0070619002), and NJUPT-SF (Grant No. NY218128).

Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction

Fenghua Qi(戚凤华)¹ and Xingfei Zhou(周兴飞)^2,†

1 School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China;
2 New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China

Received:2021-11-08 Revised:2021-12-24 Accepted:2021-12-29 Online:2022-06-09 Published:2022-06-13
Contact: Xingfei Zhou E-mail:zxf@njupt.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 12104232, 11805103, and 11804167), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20190137 and BK20180739), the Innovation Research Project of Jiangsu Province (Grant No. CZ0070619002), and NJUPT-SF (Grant No. NY218128).

摘要/Abstract

摘要： We investigate the transport properties of electron in a 1T'-MoS₂-based p-n junction. The anisotropic refraction of electron is found when the electron beam crosses the p-n junction, which brings the phenomenon of valley splitting without any external fields. Moreover, it is found that the valley-spin-dependent anomalous Klein tunneling, i.e., the perfect transmission exists at a nonzero incident angle of valley-spin-dependent electron, happens when the vertical electric field is equal to the critical electric field. These two peculiar properties arise from the same reason that the tilted band structure makes the directions of wavevector and velocity different. Our work designs a special valley splitter without any external fields and finds a new type of Klein tunneling.

关键词: 1T'-MoS₂, anisotropic refraction, valley splitting, Klein tunneling

Abstract: We investigate the transport properties of electron in a 1T'-MoS₂-based p-n junction. The anisotropic refraction of electron is found when the electron beam crosses the p-n junction, which brings the phenomenon of valley splitting without any external fields. Moreover, it is found that the valley-spin-dependent anomalous Klein tunneling, i.e., the perfect transmission exists at a nonzero incident angle of valley-spin-dependent electron, happens when the vertical electric field is equal to the critical electric field. These two peculiar properties arise from the same reason that the tilted band structure makes the directions of wavevector and velocity different. Our work designs a special valley splitter without any external fields and finds a new type of Klein tunneling.

Key words: 1T'-MoS₂, anisotropic refraction, valley splitting, Klein tunneling

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)

Fenghua Qi(戚凤华) and Xingfei Zhou(周兴飞). Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction[J]. 中国物理B, 2022, 31(7): 77301-077301.

Fenghua Qi(戚凤华) and Xingfei Zhou(周兴飞). Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction[J]. Chin. Phys. B, 2022, 31(7): 77301-077301.

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Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction

Anisotropic refraction and valley-spin-dependent anomalous Klein tunneling in a 1T'-MoS₂-based p-n junction

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