Summary: Computational Physics (Computational) : Poster
Path­integral Monte Carlo study of phonons in the bcc
phase of 4 He
Slava Sorkin 1 , Polturak Emil 1 and Joan Adler 1
, 1 Physics Department, Technion ­ Israel Institute of Technology, Haifa, Israel,
32000
(Submitted by Slava Sorkin , Physics Department, Technion ­ Israel Institute of
Technology, Haifa, Israel, 32000, phsorkin@techunix.technion.ac.il)
Using Path Integral Monte Carlo and the Maximum Entropy method, we calcu­
late the dynamic structure factor of solid 4 He in the bcc phase at a finite temperature
of T = 1.6 K and a molar volume of 21 cm 3 . Both the single­phonon contribution
to the dynamic structure factor and the total dynamic structure factor are evalu­
ated. From the dynamic structure factor, we obtain the phonon dispersion relations
along the main crystalline directions, [001], [011] and [111]. We calculate both the
longitudinal and transverse phonon branches. We discuss the di#erences between
dispersion relations resulting from the single­phonon part vs. the total dynamic
structure factor. In addition, we evaluate the formation energy of a vacancy.
1


Source: Adler, Joan - Physics Department, Technion, Israel Institute of Technology

Collections: Physics