Mixed-order transition and tricritical point associated with checkerboard supersolidity in the two-dimensional t2-V1 model
Abstract
We use quantum Monte Carlo method employing stochastic-series-expansion technique to study the ground state properties of the t2-V1 model of hard-core bosons on a square lattice. We find that, away from half fillings, the minimal combination of nearest-neighbor repulsion V1 and next-nearest-neighbor hopping t2 may give rise to checkerboard supersolidity. The nature of the quantum phase transition, where the superfluid changes to a checkerboard supersolid, depends on the relative strength of V1/t2 and the average site occupancy. Interestingly, at the half filling, the model displays the extreme Thouless effect. As the filling is varied away from half filling, the model exhibits initially a mixed-order transition, next a tricritical point, and finally a second-order transition.
- Publication:
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Physical Review B
- Pub Date:
- January 2020
- DOI:
- 10.1103/PhysRevB.101.035147
- arXiv:
- arXiv:1902.10091
- Bibcode:
- 2020PhRvB.101c5147G
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 9 pages, 7 figures