A Superglass Phase of Interacting Bosons

Abstract

We introduce a Bose-Hubbard Hamiltonian with random disordered interactions as a model to study the interplay of superfluidity and glassiness in a system of three-dimensional hard-core bosons at half-filling. Solving the model using large-scale quantum Monte Carlo simulations, we show that these disordered interactions promote a stable superglass phase, where superflow and glassy density localization coexist in equilibrium without exhibiting phase separation. The robustness of the superglass phase is underlined by its existence in a replica mean-field calculation on the infinite-dimensional Hamiltonian.

4 pages 3 figures: to appear in Phys. Rev. Lett.

References in corpus (3)

• Disordered quantum gases under control
• Evidence for a Superglass State in Solid 4He
• Bose-Einstein condensation in quantum glasses

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