Metal to Insulator Transition in the 2-D Hubbard Model: A Slave Boson Approach
Abstract
We use the Kotliar-Ruckenstein slave boson technique to treat the strong correlation of the Hubbard model. In a first part we discuss the metal to insulator transition that is occurring on the honeycomb lattice at half filling. We find the critical value for the interaction strength to be U/t=3.1. Above it a gap opens in the spectrum which behaves like (U-U_c) in the vicinity of the transition, and like U for strong coupling. In a second part we calculate the phase diagram of the Hubbard model on the square lattice at finite temperature. The Mermin-Wagner theorem is fulfilled in the largest part of the phase diagram. In the strong coupling regime, the uniform magnetic susceptibility shows a maximum in its doping dependence in agreement with numerical simulations.
Keywords
Cite
@article{arxiv.cond-mat/9603125,
title = {Metal to Insulator Transition in the 2-D Hubbard Model: A Slave Boson Approach},
author = {Raymond Fresard and Klaus Doll},
journal= {arXiv preprint arXiv:cond-mat/9603125},
year = {2007}
}
Comments
8 pages, postscript