Half-quantized Hall Plateaus in the Confined Geometry of Graphene
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arXiv
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| Format: | Preprint |
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2024
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| author | Pandey, Preeti Manna, Sourav Frei, Kristiana N. Saji, Jerin Denis, Anne Savin, Alexander Watanabe, Kenji Taniguchi, Takashi Hakonen, Pertti J. Das, Ankur Kumar, Manohar |
| author_facet | Pandey, Preeti Manna, Sourav Frei, Kristiana N. Saji, Jerin Denis, Anne Savin, Alexander Watanabe, Kenji Taniguchi, Takashi Hakonen, Pertti J. Das, Ankur Kumar, Manohar |
| contents | Since the ground-breaking discovery of the quantum Hall effect, half-quantized quantum Hall plateaus have been some of the most studied and sought-after states. Their importance stems not only from the fact that they transcend the composite fermion framework used to explain fractional quantum Hall states (such as Laughlin states). Crucially, they hold promise for hosting non-Abelian excitations, which are essential for developing topological qubits - key components for fault-tolerant quantum computing. In this work, we show that these coveted half-quantized plateaus can appear in more than one unexpected way. We report the observation of fractional states with conductance quantization at $ν_H = 5/2$ arising due to charge equilibration in the confined region of a quantum point contact in monolayer graphene. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Half-quantized Hall Plateaus in the Confined Geometry of Graphene Pandey, Preeti Manna, Sourav Frei, Kristiana N. Saji, Jerin Denis, Anne Savin, Alexander Watanabe, Kenji Taniguchi, Takashi Hakonen, Pertti J. Das, Ankur Kumar, Manohar Mesoscale and Nanoscale Physics Since the ground-breaking discovery of the quantum Hall effect, half-quantized quantum Hall plateaus have been some of the most studied and sought-after states. Their importance stems not only from the fact that they transcend the composite fermion framework used to explain fractional quantum Hall states (such as Laughlin states). Crucially, they hold promise for hosting non-Abelian excitations, which are essential for developing topological qubits - key components for fault-tolerant quantum computing. In this work, we show that these coveted half-quantized plateaus can appear in more than one unexpected way. We report the observation of fractional states with conductance quantization at $ν_H = 5/2$ arising due to charge equilibration in the confined region of a quantum point contact in monolayer graphene. |
| title | Half-quantized Hall Plateaus in the Confined Geometry of Graphene |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.03896 |