6533b820fe1ef96bd1279bb7
RESEARCH PRODUCT
Structure of metastable 2D liquid helium
V. ApajaM. Saarelasubject
Condensed Matter::Quantum GasesPhase transitionMaterials scienceCondensed matter physicsStatistical Mechanics (cond-mat.stat-mech)Liquid heliumCondensed Matter::OtherGeneral Physics and AstronomyFOS: Physical scienceslaw.inventionCondensed Matter - Other Condensed MatterSuperfluidityCrystalCondensed Matter::Soft Condensed MatterlawPhase (matter)MetastabilityDiffusion Monte CarloGround stateCondensed Matter - Statistical MechanicsOther Condensed Matter (cond-mat.other)description
We present diffusion Monte Carlo (DMC) results on a novel, superfluid phase in two-dimensional 4He at densities higher than 0.065 A-2, which is very close to the freezing density. The new phase has anisotropic, hexatic orbital order, but the single-particle density remains constant. By increasing density the hexatic superfluid forms a metastable state, which lies above the crystal ground state in energy. This implies that the liquid-solid phase transition takes place in two stages: a second-order phase transition from the isotropic superfluid to the hexatic superfluid, followed by a first-order transition that localizes atoms into the triangular crystal order.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-11-01 |