Gapped Dirac materials and quantum valley currents in dual-gated hBN/bilayer-graphene heterostructures
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866909340232843264 |
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| author | Iwasaki, Takuya Morita, Yoshifumi Watanabe, Kenji Taniguchi, Takashi |
| author_facet | Iwasaki, Takuya Morita, Yoshifumi Watanabe, Kenji Taniguchi, Takashi |
| contents | In gapped Dirac materials, the topological current associated with each valley can flow in opposite directions creating long-range charge-neutral valley currents. We report valley currents in hBN/bilayer-graphene heterostructures with an energy gap, which is tunable by a perpendicular electric (displacement) field in a dual-gated structure. We observed significant nonlocal resistance, consistent with the scaling theory of the valley Hall effect. In the low-temperature limit, the nonlocal resistance approaches a saturated value near the "quantum limit," indicating the emergence of quantum valley currents. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_05636 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gapped Dirac materials and quantum valley currents in dual-gated hBN/bilayer-graphene heterostructures Iwasaki, Takuya Morita, Yoshifumi Watanabe, Kenji Taniguchi, Takashi Mesoscale and Nanoscale Physics In gapped Dirac materials, the topological current associated with each valley can flow in opposite directions creating long-range charge-neutral valley currents. We report valley currents in hBN/bilayer-graphene heterostructures with an energy gap, which is tunable by a perpendicular electric (displacement) field in a dual-gated structure. We observed significant nonlocal resistance, consistent with the scaling theory of the valley Hall effect. In the low-temperature limit, the nonlocal resistance approaches a saturated value near the "quantum limit," indicating the emergence of quantum valley currents. |
| title | Gapped Dirac materials and quantum valley currents in dual-gated hBN/bilayer-graphene heterostructures |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.05636 |