 
Summary: Path Integral Monte Carlo study of phonons
in the bcc phase of 4
He
V. Sorkin, E. Polturak and Joan Adler
Department of Physics
Technion  Israel Institute of Technology.
1
Introduction & Objectives
Solid helium, the wellknown example of a quantum solid, continues to be a
subject of interest to theorists and experimentalists alike. It is characterized
by large zeropoint motion and significant shortrange correlation of its atoms.
These effects make the theoretical description of the solid very difficult.
The self  consistent phonon method [1], was developed to treat this problem.
The theoretical predictions agree well with experiment in the fcc and hcp solid
phases. In the lowdensity bcc phase, the agreement between the theory and
experiment is less satisfactory, in particular regarding the transverse phonons
along the [110] direction. Therefore, we decided to calculate the phonon spec
trum in the bcc phase using Quantum Monte Carlo simulations [2].
2
Models & Methods
