Influence of the velocity barrier on the massive Dirac electron transport in a monolayer MoS<sub>2</sub> quantum structure

doi:10.1007/s11467-020-0955-7

Front. Phys.

2020, Vol. 15

Issue (3) : 33603 https://doi.org/10.1007/s11467-020-0955-7

RESEARCH ARTICLE

Influence of the velocity barrier on the massive Dirac electron transport in a monolayer MoS₂ quantum structure

X.-J. Hao¹, R.-Y. Yuan¹(

), J.-J. Jin¹, Y. Guo^2,³

¹. Center for Theoretical Physics, Department of Physics, Capital Normal University, Beijing 100048, China
². Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
³. Collaborative Innovation Center of Quantum Matter, Beijing, China

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Abstract

Using the transfer matrix method, spin- and valley-dependent electron transport properties modulated by the velocity barrier were studied in the normal/ferromagnetic/normal monolayer MoS₂ quantum structure. Based on Snell’s Law in optics, we define the velocity barrier as ξ=v₂/v₁ by changing the Fermi velocity of the intermediate ferromagnetic region to obtain a deflection condition during the electron transport process in the structure. The results show that both the magnitude and the direction of spin- and valley-dependent electron polarization can be regulated by the velocity barrier. –100% polarization of spin- and valley-dependent electron can be achieved for ξ>1, while 100% polarization can be obtained for ξ<1. Furthermore, it is determined that perfect spin and valley transport always occur at a large incident angle. In addition, the spin- and valley-dependent electron transport considerably depends on the length k_FL and the gate voltage U(x) of the intermediate ferromagnetic region. These findings provide an effective method for designing novel spin and valley electronic devices.

Keywords velocity barrier monolayer MoS₂ spin valley polarization

Corresponding Author(s): R.-Y. Yuan

Issue Date: 13 April 2020

Cite this article:

X.-J. Hao,R.-Y. Yuan,J.-J. Jin, et al. Influence of the velocity barrier on the massive Dirac electron transport in a monolayer MoS₂ quantum structure[J]. Front. Phys. , 2020, 15(3): 33603.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-020-0955-7
https://academic.hep.com.cn/fop/EN/Y2020/V15/I3/33603

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