Quantum Monte Carlo simulations for the Bose-Hubbard model with random chemical potential; localized Bose-Einstein condensation without superfluidity

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The hardcore-Bose-Hubbard model with random chemical potential is investigated using quantum Monte Carlo simulation. We consider two cases of random distribution of the chemical potential: a uniformly random distribution and a correlated distribution. The temperature dependences of the superfluid density, the specific heat, and the correlation functions are calculated. If the distribution of the randomness is correlated, there exists an intermediate state, which can be thought of as a localized condensate state of bosons, between the superfluid state and the normal state.
4 pages, 7 figures

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Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/223381

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0903.2537
 http://arxiv.org/abs/0903.2537

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arXiv