Doublon-holon-binding mechanism of Mott transition in 2D Hubbard model

T. Miyagawa, H. Yokoyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 languageEnglish
Pages (from-to)738-742
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - 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

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