| Texto completo | |
| Autor(es): |
de Koning, Maurice
;
Cai, Wei
;
Cazorla, Claudio
;
Boronat, Jordi
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review Letters; v. 130, n. 1, p. 6-pg., 2023-01-06. |
| Resumo | |
The mass transport properties along dislocation cores in hcp 4He are revisited by considering two types of edge dislocations as well as a screw dislocation, using a fully correlated quantum simulation approach. Specifically, we employ the zero-temperature path-integral ground state (PIGS) method together with ergodic sampling of the permutation space to investigate the fundamental dislocation core structures and their off-diagonal long-range order properties. It is found that the Bose-Einstein condensate fraction of such defective 4He systems is practically null (<= 10-6), just as in the bulk defect-free crystal. These results provide compelling evidence for the absence of intrinsic superfluidity in dislocation cores in hcp 4He and challenge the superfluid dislocation-network interpretation of the mass-flux-experiment observations, calling for further experimental investigation. (AU) | |
| Processo FAPESP: | 16/23891-6 - Modelagem computacional da matéria condensada |
| Beneficiário: | Alex Antonelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais |
| Beneficiário: | Munir Salomao Skaf |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |