title: Superglass phase of 4He.
abstract: We study different solid phases of 4He, by means of path integral Monte Carlo simulations based on a recently developed worm algorithm. Our study includes simulations that start off from a high- gas phase, which is then "quenched" down to T = 0.2 K. The low-T properties of the system crucially depend on the initial state. While an ideal hcp crystal is a clear-cut insulator, the disordered system freezes into a superglass, i.e., a metastable amorphous solid featuring off-diagonal long-range order and superfluidity.
authors.affiliation: Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1, Canada.
authors.forename: Massimo
authors.initials: M
authors.lastname: Boninsegni
authors.forename: Nikolay
authors.initials: N
authors.lastname: Prokof'ev
authors.forename: Boris
authors.initials: B
authors.lastname: Svistunov