Abstract
The mechanism of nonmagnetic Mott transitions in the Hubbard model on the square lattice is studied, using a variational Monte Carlo method. A simple doublon (D)-holon (H) binding mechanism a previous study proposed [J. Phys. Soc. Jpn. 75 (2006) 114706] has to be modified, because even a wave function with completely bound D-H pairs brings about a Mott transition at a finite correlation strength. By introducing two characteristic lengths, D-H pair binding length, ξDH, and minimum inter-doublon distance, ξDD, we can properly describe the physics of Mott transitions, and determine the critical point by ξDD ∼ ξDH. This concept seems universal, because it is valid not only for newly introduced wave functions with long-range D-H and D-D (H-H) correlation factors discussed here, but for a wide range of wave functions with D-H binding factors.
Original language | English |
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Pages (from-to) | 738-742 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 471 |
Issue number | 21-22 |
DOIs | |
Publication status | Published - 2011 Nov |
Keywords
- Doublon
- Holon
- Hubbard model
- Mechanism
- Mott transition
- Variational Monte Carlo method
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering