Topological quantum phases of 4He confined to nanoporous materials.

@article{Pollet2014TopologicalQP,
  title={Topological quantum phases of 4He confined to nanoporous materials.},
  author={Lode Pollet and Anatoly B. Kuklov},
  journal={Physical review letters},
  year={2014},
  volume={113 4},
  pages={
          045301
        }
}
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… 
Critical flow and dissipation in a quasi–one-dimensional superfluid
TLDR
The flow rate of liquid helium is measured and the superfluid velocity deduced in a capillary flow experiment occurring in single 30-nm-long nanopores with radii ranging down from 20 to 3 nm, and deviations from bulk behavior are interpreted as signaling the crossover to a quasi-1D state.
Dimensional reduction of helium-4 inside argon-plated MCM-41 nanopores
The angstrom-scale coherence length describing the superfluid wave function of $^{4}\mathrm{He}$ at low temperatures has prevented its preparation in a truly one-dimensional geometry. Mesoporous
Dissipation in mesoscale superfluids
We investigate the maximum speed at which a driven superfluid can flow through a narrow constriction with a size on the order of the healing length. Considering dissipation via the thermal nucleation
Mass Flux Experiments in Solid $$^4$$He: Some History, Recent Work and the Current Status
  • R. Hallock
  • Physics
    Journal of Low Temperature Physics
  • 2019
Measurements that document a number of the characteristics of $$^{4}\hbox {He}$$  mass flux through a cell filled with solid $$^{4}\hbox {He}$$  carried out at the University of Massachusetts and

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