TY - JOUR
T1 - Doublon-holon-binding mechanism of Mott transition in 2D Hubbard model
AU - Miyagawa, T.
AU - Yokoyama, H.
N1 - Funding Information:
The authors thank Masao Ogata, Tomoharu Tsuji and Yu Kanamori for useful discussions. This work is partly supported by Grant-in-Aids from the Ministry of Education, Culture, Sports, Science and Technology, Japan .
PY - 2011/11
Y1 - 2011/11
N2 - 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.
AB - 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.
KW - Doublon
KW - Holon
KW - Hubbard model
KW - Mechanism
KW - Mott transition
KW - Variational Monte Carlo method
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U2 - 10.1016/j.physc.2011.05.041
DO - 10.1016/j.physc.2011.05.041
M3 - Article
AN - SCOPUS:80054975369
SN - 0921-4534
VL - 471
SP - 738
EP - 742
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 21-22
ER -