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Absence of Off-Diagonal Long-Range Order in hcp 4He Dislocation Cores

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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