| Texto completo | |
| Autor(es): |
Piva, M. M.
;
Wawrzynczak, R.
;
Kumar, Nitesh
;
Kutelak, L. O.
;
Lombardi, G. A.
;
dos Reis, R. D.
;
Felser, C.
;
Nicklas, M.
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW MATERIALS; v. 8, n. 4, p. 6-pg., 2024-04-29. |
| Resumo | |
At ambient pressure, HfTe5 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 HfTe5 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 ground state for the emergence of the QHE in HfTe5 and thus favors a scenario based on a low carrier density metal in the quantum limit for the observed signatures of the quasiquantized 3D QHE. (AU) | |
| Processo FAPESP: | 22/05447-2 - Propriedades de transporte sob ajuste de pressão dos candidatos a semimetais de Weyl EuB6 e MoTe2 |
| Beneficiário: | Leonardo Oparacz Kutelak |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| Processo FAPESP: | 18/00823-0 - Novos estados topológicos da matéria sob condições extremas |
| Beneficiário: | Ricardo Donizeth dos Reis |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 21/02314-9 - Entendendo materiais quânticos com topologia não trivial utilizando pressão uniaxial e hidrostática |
| Beneficiário: | Leonardo Oparacz Kutelak |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |