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On the Coexistence of Diagonal and off-Diagonal Long-Range Order, a Monte Carlo Study

Anne van Otterlo·Karl-Heinz Wagenblast
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Abstract

The zero temperature properties of interacting 2 dimensional lattice bosons are investigated. We present Monte Carlo data for soft-core bosons that demonstrate the existence of a phase in which crystalline long-range order and off-diagonal long-range order (superfluidity) coexist. We comment on the difference between hard and soft-core bosons and compare our data to mean-field results that predict a larger coexistence region. Furthermore, we determine the critical exponents for the various phase transitions.

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Anne van Otterlo, Karl-Heinz Wagenblast. 1993-12-08. On the Coexistence of Diagonal and off-Diagonal Long-Range Order, a Monte Carlo Study. https://doi.org/10.1103/physrevlett.72.3598

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