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Chin. Phys. B, 2022, Vol. 31(7): 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
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.
Keywords:  1T'-MoS2      anisotropic refraction      valley splitting      Klein tunneling  
Received:  08 November 2021      Revised:  24 December 2021      Accepted manuscript online:  29 December 2021
PACS:  73.22.Pr (Electronic structure of graphene)  
  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)  
Fund: 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).
Corresponding Authors:  Xingfei Zhou     E-mail:

Cite this article: 

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 2022 Chin. Phys. B 31 077301

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