The fate of vacancy-induced supersolidity in 4He

Abstract

The supersolid state of matter, exhibiting non-dissipative flow in solids, has been elusive for thirty five years. The recent discovery of a non-classical moment of inertia in solid 4He by Kim and Chan provided the first experimental evidence, although the interpretation in terms of supersolidity of the ideal crystal phase remains subject to debate. Using quantum Monte Carlo methods we investigate the long-standing question of vacancy-induced superflow and find that vacancies in a 4He crystal phase separate instead of forming a supersolid. On the other hand, non-equilibrium vacancies relaxing on defects of poly-crystalline samples could provide an explanation for the experimental observations.

arXiv comment4 pages,4 figures. Replaced with published version

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• Supersolid phases in the one dimensional extended soft core Bosonic Hubbard model
• Elementary excitations of ultracold soft-core bosons across the superfluid-supersolid phase transition
• Nonclassical Rotational Inertia in Single Crystal Helium
• Local stress and superfluid properties of solid Helium-4
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• Theory of the superglass phase
• Solid 4He and the Supersolid Phase: from Theoretical Speculation to the Discovery of a New State of Matter? A Review of the Past and Present Status of Research
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• Vacancy supersolid of hard-core bosons on the square lattice
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• Torsional oscillator and synchrotron x-ray experiments on solid 4He in aerogel
• Supersolids in one dimensional Bose Fermi mixtures
• Quantum Plasticity and Supersolid Response in Helium-4
• Absence of Pressure-Driven Supersolid Flow at Low Frequency
• Absence of superfluidity in 2D dipolar Bose striped crystals
• Minimal Model for Disorder-induced Missing Moment of Inertia in Solid ${}^4$He
• Quasiequilibrium supersolid phase of a two-dimensional dipolar crystal
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