Volume 84, Number 4, November 2008
|Number of page(s)||5|
|Published online||30 October 2008|
Structure of metastable 2D liquid helium
Department of Physics, University of Jyväskylä - P.O. Box 35, FIN-40014, Finland, EU
2 Department of Physical Sciences, University of Oulu - P.O. Box 3000, FIN-90014, Finland, EU
Accepted: 3 October 2008
We present diffusion Monte Carlo (DMC) results on a novel, superfluid phase in two-dimensional 4He at densities higher than 0.065 Å-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.
PACS: 02.70.Ss – Quantum Monte Carlo methods
© EPLA, 2008
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