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Phase Diagram of Hard Core Bosons with Anisotropic Interactions

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Abstract

The phase diagram of lattice hard core bosons with nearest-neighbor interactions allowed to vary independently, from repulsive to attractive, along different crystallographic directions, is studied by quantum Monte Carlo simulations. We observe a superfluid phase, as well as two crystalline phases at half filling, either checkerboard or striped. Just like in the case of isotropic interactions, no supersolid phase is observed.

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Notes

  1. In three dimensions, as well as lower dimensions if the tilting angle exceeds a critical value, the dipolar interaction becomes purely attractive along specific directions, making the system unstable against collapse. In these cases, the dipolar interaction must be supplemented by a short-range hard core repulsion, whose presence is customarily assumed in standard theoretical studies, to ensure thermodynamic stability.

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Acknowledgements

This work was supported by the Natural Sciences and Engineering Research Council of Canada. Computing support of ComputeCanada is acknowledged.

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  1. Department of Physics, University of Alberta, T6G 2E1, Edmonton, AB, Canada

    Phong. H. Nguyen & Massimo Boninsegni

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Nguyen, P.H., Boninsegni, M. Phase Diagram of Hard Core Bosons with Anisotropic Interactions. J Low Temp Phys 209, 34–43 (2022). https://doi.org/10.1007/s10909-022-02793-x

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