High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866916358504054784 |
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| author | Huang, Ke Fu, Hailong Watanabe, Kenji Taniguchi, Takashi Zhu, Jun |
| author_facet | Huang, Ke Fu, Hailong Watanabe, Kenji Taniguchi, Takashi Zhu, Jun |
| contents | Edge states of a topological insulator can be used to explore fundamental science emerging at the interface of low dimensionality and topology. Achieving a robust conductance quantization, however, has proven challenging for helical edge states. Here we show wide resistance plateaus in kink states - a manifestation of the quantum valley Hall effect in Bernal bilayer graphene - quantized to the predicted value at zero magnetic field. The plateau resistance has a very weak temperature dependence up to 50 Kelvin and is flat within a dc bias window of tens of mV. We demonstrate the electrical operation of a topology-controlled switch with an on/off ratio of 200. These results demonstrate the robustness and tunability of the kink states and its promise in constructing electron quantum optics devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07804 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch Huang, Ke Fu, Hailong Watanabe, Kenji Taniguchi, Takashi Zhu, Jun Mesoscale and Nanoscale Physics Materials Science Edge states of a topological insulator can be used to explore fundamental science emerging at the interface of low dimensionality and topology. Achieving a robust conductance quantization, however, has proven challenging for helical edge states. Here we show wide resistance plateaus in kink states - a manifestation of the quantum valley Hall effect in Bernal bilayer graphene - quantized to the predicted value at zero magnetic field. The plateau resistance has a very weak temperature dependence up to 50 Kelvin and is flat within a dc bias window of tens of mV. We demonstrate the electrical operation of a topology-controlled switch with an on/off ratio of 200. These results demonstrate the robustness and tunability of the kink states and its promise in constructing electron quantum optics devices. |
| title | High-Temperature Quantum Valley Hall Effect with Quantized Resistance and a Topological Switch |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2408.07804 |