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Quantum Monte Carlo study of a two-species bosonic Hubbard model

机译:两物种玻色哈伯德模型的量子蒙特卡洛研究

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We consider a two-species hard-core boson Hubbard model for a supersolid, where two types of bosons represent vacancies and interstitials doped into a commensurate crystal. The on-site interspecies interaction can create bound states of vacancies and interstitials facilitating vacancy condensation at lower energies than in a single-species model, as suggested in an earlier mean-field study. Here, we carry out quantum Monte Carlo simulations to study possible supersolid phases of the model, which correspond to superfluid phases of the vacancies or interstitials. At low temperatures, we find three distinct superfluid phases. The extent of the phases and the nature of the phase transitions are discussed in comparison to mean-field theory.
机译:我们考虑一种针对超固体的两类硬核玻色子哈伯德模型,其中两种类型的玻色子代表空位,而间隙填入相应的晶体中。如较早的平均场研究所建议的那样,现场物种间的相互作用可以产生空位和间隙的结合状态,从而以比单一物种模型更低的能量促进空位凝聚。在这里,我们进行量子蒙特卡洛模拟,以研究模型可能的超固相,该相对应于空位或间隙的超流体相。在低温下,我们发现三个不同的超流体相。与平均场理论相比,讨论了相的范围和相变的性质。

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