Doublon-Holon Binding Effects on Mott Transitions in Two-Dimensional Bose Hubbard Model
arXiv:0708.2765 · doi:10.1016/j.jpcs.2008.06.087
Abstract
A mechanism of Mott transitions in a Bose Hubbard model on a square lattice is studied, using a variational Monte Carlo method. Besides an onsite correlation factor, we introduce a four-body doublon-holon factor into the trial state, which considerably improves the variational energy and can appropriately describe a superfluid-insulator transition. Its essense consists in binding (and unbinding) of a doublon to a holon in a finite short range, identical with the cases of fermions. The features of this transition are qualitatively different from those of Brinkman-Rice-type transitions.
5 pages, 6 figures, proceedings of SNS2007
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Cited by in corpus (4)
- Effect of Doublon-Holon Binding on Mott transition---Variational Monte Carlo Study of Two-Dimensional Bose Hubbard Models
- Mott Transition and Spin Structures of Spin-1 Bosons in Two-Dimensional Optical Lattice at Unit Filling
- Specialising Neural-network Quantum States for the Bose Hubbard Model
- Spinon and eta-spinon correlation functions