Quantum Monte Carlo simulation of overpressurized liquid 4He

Details Quantum Monte Carlo simulation of overpressurized liquid 4He Quantum Monte Carlo simulation of overpressurized liquid 4He

2005-07-06

arxiv.org/abs/cond-mat/0507130v1

Physics

Condensed Matter

Other Condensed Matter

5 pages, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.145302

A diffusion Monte Carlo simulation of superfluid $^4$He at zero temperature and pressures up to 275 bar is presented. Increasing the pressure beyond freezing ($\sim$ 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.

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