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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.23063 |
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| _version_ | 1866914595651715072 |
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| author | Kim, Min-Gue Kim, Min-Sik Watanabe, Kenji Taniguchi, Takashi Kim, Ju-Jin Bae, Myung-Ho |
| author_facet | Kim, Min-Gue Kim, Min-Sik Watanabe, Kenji Taniguchi, Takashi Kim, Ju-Jin Bae, Myung-Ho |
| contents | Transition metal dichalcogenides provide a platform for exploring spin-valley physics, offering a promising approach to electric-field-driven spin control for low-power spintronic and quantum devices. Here, we demonstrate electric-field-induced spin splitting in the Q and Q' valleys of multilayer n-type WSe2 using quantum-point-contact spectroscopy. Systematic modulations in four distinct conductance quantization steps, providing direct evidence of spin-valley-layer coupling-driven spin-resolved density of states, are achieved by tuning the out-of-plane gate voltage. Notably, the electric-field-induced spin splitting significantly dominate the magnetic-field-induced valley-Zeeman effect (i.e., ~7 meV for a displacement field change of ~0.08 V/nm vs. ~2 meV for a magnetic field of B = 9 T), demonstrating a powerful, non-magnetic manipulation of spin states. This ability to manipulate spin states by gate voltage is crucial for advancing next-generation low-power spintronic and quantum information technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_23063 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Non-magnetic spin splitting driven by spin-valley-layer coupling in multilayer WSe2 Kim, Min-Gue Kim, Min-Sik Watanabe, Kenji Taniguchi, Takashi Kim, Ju-Jin Bae, Myung-Ho Mesoscale and Nanoscale Physics Transition metal dichalcogenides provide a platform for exploring spin-valley physics, offering a promising approach to electric-field-driven spin control for low-power spintronic and quantum devices. Here, we demonstrate electric-field-induced spin splitting in the Q and Q' valleys of multilayer n-type WSe2 using quantum-point-contact spectroscopy. Systematic modulations in four distinct conductance quantization steps, providing direct evidence of spin-valley-layer coupling-driven spin-resolved density of states, are achieved by tuning the out-of-plane gate voltage. Notably, the electric-field-induced spin splitting significantly dominate the magnetic-field-induced valley-Zeeman effect (i.e., ~7 meV for a displacement field change of ~0.08 V/nm vs. ~2 meV for a magnetic field of B = 9 T), demonstrating a powerful, non-magnetic manipulation of spin states. This ability to manipulate spin states by gate voltage is crucial for advancing next-generation low-power spintronic and quantum information technologies. |
| title | Non-magnetic spin splitting driven by spin-valley-layer coupling in multilayer WSe2 |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.23063 |