title: Topological quantum phases of 4He confined to nanoporous materials.
abstract: The ground state of (4)He confined in a system with the topology of cylinder can display properties of solid, superfluid, and liquid crystal. This phase, which we call a compactified supersolid (CSS), originates from wrapping the basal planes of the bulk hcp solid into concentric cylindrical shells, with several central shells exhibiting superfluidity along the axial direction. Its main feature is the presence of a topological defect which can be viewed as a disclination with Frank index n = 1 observed in liquid crystals, and which, in addition, has a superfluid core. The CSS as well as its transition to an insulating compactified solid with a very wide hysteresis loop are found by ab initio Monte Carlo simulations. A simple analytical model captures qualitatively correctly the main property of the CSS--a gradual decrease of the superfluid response with increasing pressure.
authors.affiliation: Department of Physics, Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, University of Munich, Theresienstrasse 37, 80333 Munich, Germany.
authors.forename: Lode
authors.initials: L
authors.lastname: Pollet
authors.affiliation: Department of Engineering Science and Physics, CUNY, Staten Island, New York 10314, USA.
authors.forename: Anatoly B
authors.initials: AB
authors.lastname: Kuklov