Superglass Phase of Helium-four

Details Superglass Phase of Helium-four Superglass Phase of Helium-four

2005-12-05

arxiv.org/abs/cond-mat/0512103v6

Phys. Rev. Lett. 96, 105301 (2006)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.96.105301

We study different solid phases of Helium-four, 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-T 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.

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