Quantum Monte Carlo simulation of overpressurized liquid 4He
Other Condensed Matter
2009-11-11 v1
Abstract
A diffusion Monte Carlo simulation of superfluid He at zero temperature and pressures up to 275 bar is presented. Increasing the pressure beyond freezing ( 25 bar), the liquid enters the overpressurized phase in a metastable state. In this regime, we report results of the equation of state and the pressure dependence of the static structure factor, the condensate fraction, and the excited-state energy corresponding to the roton. Along this large pressure range, both the condensate fraction and the roton energy decrease but do not become zero. The roton energies obtained are compared with recent experimental data in the overpressurized regime.
Cite
@article{arxiv.cond-mat/0507130,
title = {Quantum Monte Carlo simulation of overpressurized liquid 4He},
author = {L. Vranjes and J. Boronat and J. Casulleras and C. Cazorla},
journal= {arXiv preprint arXiv:cond-mat/0507130},
year = {2009}
}
Comments
5 pages, accepted for publication in Phys. Rev. Lett