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- Title
QUANTUM MONTE CARLO STUDY OF OVERPRESSURIZED LIQUID <sup>4</sup>He AT ZERO TEMPERATURE.
- Authors
MARKIĆ, LEANDRA VRANJEŠ; BORONAT, JORDI; CASULLERAS, JOAQUIM; CAZORLA, CALUDIO
- Abstract
We present a diffusion Monte Carlo simulation of metastable superfluid 4He at zero temperature and pressures beyond freezing (~ 25 bar) up to 275 bar. The equation of state of liquid 4He is extended to the overpressurized regime, where the pressure dependence of the static structure factor and the condensate fraction is obtained. Along this large pressure range, excited-state energy corresponding to the roton has been determined using the release-node technique. Our results show that both the roton energies and the condensate fraction decrease with increasing pressure but do not become zero. We compare our calculations to recent experimental data in overpressurized regime.
- Subjects
MONTE Carlo method; SEMICONDUCTOR doping; HELIUM at low temperatures; PROPERTIES of matter; SUPERFLUIDITY; QUASIPARTICLES; PARTICLES (Nuclear physics); ATMOSPHERIC pressure
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2006, Vol 20, Issue 30/31, p5154
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979206036211