Importance of the semimetallic state for the quantum Hall effect in HfTe$_{5}$
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910428174483456 |
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| author | Piva, M. M. Wawrzyńczak, R. Kumar, Nitesh Kutelak, L. O. Lombardi, G. A. Reis, R. D. dos Felser, C. Nicklas, M. |
| author_facet | Piva, M. M. Wawrzyńczak, R. Kumar, Nitesh Kutelak, L. O. Lombardi, G. A. Reis, R. D. dos Felser, C. Nicklas, M. |
| contents | At ambient pressure, HfTe$_{5}$ is a material at the boundary between a weak and a strong topological phase, which can be tuned by changes in its crystalline structure or by the application of high magnetic fields. It exhibits a Lifshitz transition upon cooling, and three-dimensional (3D) quantum Hall effect (QHE) plateaus can be observed at low temperatures. Here, we have investigated the electrical transport properties of HfTe$_{5}$ under hydrostatic pressure up to 3 GPa. We find a pressure-induced crossover from a semimetallic phase at low pressures to an insulating phase at about 1.5 GPa. Our data suggest the presence of a pressure-induced Lifshitz transition at low temperatures within the insulating phase around 2 GPa. The quasi-3D QHE is confined to the low-pressure region in the semimetallic phase. This reveals the importance of the semimetallic groundstate for the emergence of the QHE in HfTe$_{5}$ and thus favors a scenario based on a low carrier density metal in the quantum limit for the observed signatures of the quasi-quantized 3D QHE. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_13969 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Importance of the semimetallic state for the quantum Hall effect in HfTe$_{5}$ Piva, M. M. Wawrzyńczak, R. Kumar, Nitesh Kutelak, L. O. Lombardi, G. A. Reis, R. D. dos Felser, C. Nicklas, M. Materials Science Strongly Correlated Electrons At ambient pressure, HfTe$_{5}$ is a material at the boundary between a weak and a strong topological phase, which can be tuned by changes in its crystalline structure or by the application of high magnetic fields. It exhibits a Lifshitz transition upon cooling, and three-dimensional (3D) quantum Hall effect (QHE) plateaus can be observed at low temperatures. Here, we have investigated the electrical transport properties of HfTe$_{5}$ under hydrostatic pressure up to 3 GPa. We find a pressure-induced crossover from a semimetallic phase at low pressures to an insulating phase at about 1.5 GPa. Our data suggest the presence of a pressure-induced Lifshitz transition at low temperatures within the insulating phase around 2 GPa. The quasi-3D QHE is confined to the low-pressure region in the semimetallic phase. This reveals the importance of the semimetallic groundstate for the emergence of the QHE in HfTe$_{5}$ and thus favors a scenario based on a low carrier density metal in the quantum limit for the observed signatures of the quasi-quantized 3D QHE. |
| title | Importance of the semimetallic state for the quantum Hall effect in HfTe$_{5}$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2404.13969 |