Supersolid phases of Rydberg-excited bosons on a triangular lattice
arXiv:1903.01912 · doi:10.1103/PhysRevA.99.063625
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.
arXiv comment13 pages, 8 figures
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- Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study
- Ground state phase diagram of ultrasoft bosons