Quantum Monte Carlo simulation of overpressurized liquid 4He

Abstract

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.

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

References in corpus (5)

• Monte Carlo Analysis of a New Interatomic Potential for He
• Cavitation pressure in liquid helium
• Monte Carlo Calculations for Liquid ${}^4$He at Negative Pressure
• Path integral Monte Carlo simulation of helium at negative pressures
• Microscopic calculation of the phonon-roton branch in superfluid ${}^4$He

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• Particle approximation of the two-fluid model for superfluid ${}^4$He using smoothed particle hydrodynamics
• Structure of metastable 2D liquid helium
• A coordinated wavefunction for the ground state of liquid helium-4
• Quantum Phase Transition with a Simple Variational Ansatz