Theoretical study of spin-dependent transport in WSe$_2$-based vertical spin valves
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arXiv
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| Format: | Preprint |
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2026
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| author | Wang, Yibo Liu, Yuchen Wang, Xinhe Yang, Wang |
| author_facet | Wang, Yibo Liu, Yuchen Wang, Xinhe Yang, Wang |
| contents | We theoretically investigate spin-dependent transport in a TMD-based vertical spin valve, taking WSe$_2$ as a representative example. Using effective Hamiltonians for the heterostructure and the Landauer formula, we derive the transmission and reflection coefficients within a transfer-matrix approach. The calculated magnetoresistance shows an oscillatory dependence on the WSe$_2$ thickness when the Fermi level is tuned near the valence-band maximum. The effects of gate voltage and exchange fields on the magnetoresistance are further analyzed. We also identify a Fabry-Pérot-like interference contribution to the magnetoresistance, which can enhance or even induce negative magnetoresistance in certain thickness regimes. Our results provide a qualitative understanding of the negative magnetoresistance observed in WSe$_2$-based spin valves and may offer useful insights for the design of tunable spintronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_03762 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Theoretical study of spin-dependent transport in WSe$_2$-based vertical spin valves Wang, Yibo Liu, Yuchen Wang, Xinhe Yang, Wang Mesoscale and Nanoscale Physics We theoretically investigate spin-dependent transport in a TMD-based vertical spin valve, taking WSe$_2$ as a representative example. Using effective Hamiltonians for the heterostructure and the Landauer formula, we derive the transmission and reflection coefficients within a transfer-matrix approach. The calculated magnetoresistance shows an oscillatory dependence on the WSe$_2$ thickness when the Fermi level is tuned near the valence-band maximum. The effects of gate voltage and exchange fields on the magnetoresistance are further analyzed. We also identify a Fabry-Pérot-like interference contribution to the magnetoresistance, which can enhance or even induce negative magnetoresistance in certain thickness regimes. Our results provide a qualitative understanding of the negative magnetoresistance observed in WSe$_2$-based spin valves and may offer useful insights for the design of tunable spintronic devices. |
| title | Theoretical study of spin-dependent transport in WSe$_2$-based vertical spin valves |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.03762 |