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Physical review. B, Condensed matter

Phase diagram of disordered boson systems in the presence of random hopping

Yu‐qiang Ma, W. Figueiredo

Published Aug 1, 1996• 3 citations
Publisher

Abstract

We consider a generalization of the hard-core disordered boson system with the inclusion of random boson hopping. The phase diagrams are obtained, and the effects of the random boson hopping on the zero-temperature quantum phase transitions are studied. The existence of Bose-glass and superfluid glass phases is also investigated. The behavior of both continuous and first-order transitions as well as the tricritical point is discussed as a function of the strength of random on-site energies. The possible Bose glass displayed by the system due to the presence of the disorder is examined. \textcopyright{} 1996 The American Physical Society.

DOI
10.1103/physrevb.54.4183

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We consider a generalization of the hard-core disordered boson system with the inclusion of random boson hopping. The phase diagrams are obtained, and the effects of the random boson hopping on the zero-temperature quantum phase transitions are studied. The existence of Bose-glass and superfluid glass phases is also investigated. The behavior of both continuous and first-order transitions as well as the tricritical point is discussed as a function of the strength of random on-site energies. The possible Bose glass displayed by the system due to the presence of the disorder is examined. \textcopyright{} 1996 The American Physical Society.
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We consider the physics of lattice bosons affected by disordered on-site interparticle interactions. Characteristic qualitative changes in the zero-temperature phase diagram are observed when compared to the case of randomness in the chemical potential. The Mott-insulating regions shrink and eventually vanish for any finite disorder strength beyond a sufficiently large filling factor. Furthermore, at low values of the chemical potential both the superfluid and Mott insulator are stable towards formation of a Bose glass leading to a possibly nontrivial tricritical point. We discuss feasible experimental realizations of our scenario in the context of ultracold atoms on optical lattices.
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