Dislocation Mobility in a Quantum Crystal: the Case of Solid 4He

Abstract

We investigate the structure and mobility of dislocations in hcp 4He crystals. In addition to fully characterizing the five elastic constants of this system, we obtain direct insight into dislocation core structures on the basal plane, which demonstrates a tendency toward dissociation into partial dislocations. Moreover, our results suggest that intrinsic lattice resistance is an essential factor in the mobility of these dislocations. This insight sheds new light on the possible correlation between dislocation mobility and the observed macroscopic behavior of crystalline 4He.

10 pages, 3 Figures

References in corpus (3)

• Low Temperature Shear Modulus Changes in Solid 4-He and Connection to Supersolidity
• Luttinger Liquid in the Core of Screw Dislocation in Helium-4
• A Gross-Pitaevskii Treatment for Supersolid He

Cited by in corpus (10)

• Simulation and understanding of quantum crystals
• Supersolid phase transitions for hardcore bosons on a triangular lattice
• The elastic constants of solid 4He under pressure: a diffusion Monte Carlo study
• Dislocation induced anomalous softening of solid helium
• Elastic constants of hcp ${}^4$He: Path-integral Monte Carlo results versus experiment
• Plastic response by dislocation glide in solid helium under dc strain rate loading
• Sound velocities of hexagonal close-packed H2 and He under pressure
• A microscopic description of vacancies in solid 4He
• Estimated values of the kinetic energy for liquid ${}^3$He
• Study of solid 4He in two dimensions. The issue of zero-point defects and study of confined crystal