Ring-exchange interactions have been proposed as a possible mechanism for a Bose-liquid phase at zero temperature, a phase that is compressible with no superfluidity. Using the stochastic Green function algorithm (SGF), we study the effect of these interactions for bosons on a two-dimensional triangular lattice. We show that the supersolid phase that is known to exist in the ground state for a wide range of densities is rapidly destroyed as the ring-exchange interactions are turned on. We establish the ground-state phase diagram of the system, which is characterized by the absence of the expected Bose-liquid phase.
Publication Source (Journal or Book title)
Physical Review B
Rousseau, V., Hettiarachchilage, K., Tam, K., Jarrell, M., & Moreno, J. (2016). Bose-Hubbard model on a triangular lattice with diamond ring exchange. Physical Review B, 94 (14) https://doi.org/10.1103/PhysRevB.94.144514