Superfluidity versus localization in bulk 4He at zero temperature

Abstract

We present a zero-temperature quantum Monte Carlo calculation of liquid ${}^4$He immersed in an array of confining potentials. These external potentials are centered in the lattice sites of a fcc solid geometry and, by modifying their well depth and range, the system evolves from a liquid phase towards a progressively localized system which mimics a solid phase. The superfluid density decreases with increasing order, reaching a value ${\rho }_{\mathrm{s}}/\rho =0.079(16)$ when the Lindemann's ratio of the model equals the experimental value for solid ${}^4$He.

5 pages,5 figures

References in corpus (1)

• Ring exchanges and the supersolid phase of 4He