Journal
CURRENT APPLIED PHYSICS
Volume 37, Issue -, Pages 52-56Publisher
ELSEVIER
DOI: 10.1016/j.cap.2022.01.009
Keywords
MoS 2 zigzag nanoribbon; Spin-polarized edge current; Spin filtering; Spin inversion symmetry; Spin-orbit coupling; Exchange field effect
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2019R1A2C1088327]
- Ministry of Education [NRF-2018R1D1A1B07046338]
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By studying the electronic structure and quantum transport of a zigzag monolayer molybdenum disulfide nanoribbon, it has been found that spin-selective transport can be achieved and spin filters can be constructed using implanted nanoribbons.
The electronic structure and quantum transport of a zigzag monolayer molybdenum disulfide (MoS2) nanoribbon are investigated using a six-band tight-binding model. For metallic edge modes, considering both an intrinsic spin-orbit coupling and local exchange field effects, spin degeneracy and spin inversion symmetry are broken and spin selective transport is possible. Our model is a three-terminal field effect transistor with a circular-shaped gate voltage in the middle of scattering region. One terminal measures the top edge current and the other measures the bottom edge current separately. By controlling the circular gate voltage, each terminal can detect a totally spin-polarized edge current. The radius of the circular gate and the strength of the exchange field are important, because the former determines the size of the channel in both S-terminated (top) and Mo-terminated (bottom) edges and the latter is strongly related to unbalancing of the density of spin states. The results presented here suggest that it should be possible to construct spin filters using implanted MoS2 nanoribbons.
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