Absence of off-diagonal long-range order in hcp $^{\bf 4}$He dislocation cores
Abstract
The mass transport properties along dislocation cores in hcp He 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 He systems is practically null (), just as in the bulk defect-free crystal. These results provide compelling evidence for the absence of intrinsic superfluidity in dislocation cores in hcp He and challenge the superfluid dislocation-network interpretation of the mass-flux-experiment observations, calling for further experimental investigation.
Keywords
Cite
@article{arxiv.2301.02854,
title = {Absence of off-diagonal long-range order in hcp $^{\bf 4}$He dislocation cores},
author = {Maurice de Koning and Wei Cai and Claudio Cazorla and Jordi Boronat},
journal= {arXiv preprint arXiv:2301.02854},
year = {2023}
}