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arXiv · 1903.01912

Supersolid phases of Rydberg-excited bosons on a triangular lattice

Jaromir Panas·Mathieu Barbier·Andreas Geißler·Walter Hofstetter
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Abstract

Recent experiments with ultracold Rydberg-excited atoms have shown that long-range interactions can give rise to spatially ordered structures. Observation of crystalline phases in a system with Rydberg atoms loaded into an optical lattice seems also within reach. Here we investigate a bosonic model on a triangular lattice suitable for description of such experiments. Numerical simulations based on bosonic dynamical mean-field theory reveal a rich phase diagram with different supersolid phases. Comparison with the results obtained for a square lattice geometry shows qualitatively similar results in a wide range of parameters, however, on a triangular lattice we do not observe the checkerboard supersolid. Moreover, unlike on a square lattice we did not find a phase transition from uniform superfluid to supersolid induced by increase of the hopping amplitude on a triangular lattice. Based on our results we propose an intuitive interpretation of the nature of different supersolid phases. We also propose parameters for the experimental realization.

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Jaromir Panas, Mathieu Barbier, Andreas Geißler, Walter Hofstetter. 2019-03-05. Supersolid phases of Rydberg-excited bosons on a triangular lattice. https://doi.org/10.1103/physreva.99.063625

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