A microscopic description of vacancies in solid 4He
arXiv:1203.0863 · doi:10.1007/s10909-012-0616-5
Abstract
The changes that vacancies produce in the properties of hcp solid 4He are studied by means of quantum Monte Carlo methods. Our results show that the introduction of vacancies produces significant changes in the behavior of solid 4He, even when the vacancy concentration is very small. We show that there is an onset temperature where the properties of incommensurate 4He change significantly. Below this temperature, we observe the emergence of off-diagonal long range order and a complete spatial delocalization of the vacancies. This temperature is quite close to the temperature where non-classical rotational inertia has been experimentally observed. Finally, we report results on the influence of vacancies in the elastic properties of hcp 4He at zero temperature.
13 pages, accepted for publication in J. Low Temp. Phys., Special Issue on Supersolids
References in corpus (9)
- Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
- Low Temperature Shear Modulus Changes in Solid 4-He and Connection to Supersolidity
- The fate of vacancy-induced supersolidity in 4He
- Bose-Einstein Quantum Statistics and the Ground State of Solid 4He
- Phase diagram of Rydberg atoms with repulsive van der Waals interaction
- Properties of Vacancy Formation in He-4 hcp Crystals at Zero Temperature and Fixed Pressure
- Path Integral Monte Carlo calculation of momentum distribution in solid \^4\He
- Zero-point vacancies in quantum solids
- Onset temperature of Bose-Einstein condensation in incommensurate solid 4He