Zero-temperature dynamics of solid 4He from quantum Monte Carlo simulations

Abstract

The lattice dynamics of hcp crystalline 4He is studied at zero temperature and for two different densities (near and far from melting), using a ground-state path-integral quantum Monte Carlo technique. The complete phonon dispersion is obtained, with particular attention to the separation of optic and acoustic branches and to the identification of transverse modes. Our study also sheds light onto the residual coherence affecting quasiparticle excitations in the intermediate momentum region, in-between the phonon and nearly-free particle regimes.

References in corpus (2)

• Bose-Einstein Condensate in Solid Helium
• Path Integral Monte Carlo study of phonons in the bcc phase of ${}^4$He

Cited by in corpus (4)

• Universal Superfluid Transition and Transport Properties of Two-Dimensional Dirty Bosons
• Path integral Monte Carlo ground state approach: Formalism, implementation, and applications
• Reptation quantum Monte Carlo for lattice Hamiltonians with a directed-update scheme
• Probing anharmonic phonons by quantum correlators: A path integral approach