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Analysis of checkerboard electron system by path-integral renormalization group method

昌久 古賀, Akihisa Koga

Published Jan 1, 2006• 0 citations
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Mott Transition in the Hubbard Model on Checkerboard Lattice

Takuya Yoshioka, Akihisa Koga, Norio Kawakami

We investigate the bandwidth-controlled Mott transition in the Hubbard model on the checkerboard lattice at half filling using the path-integral renormalization group (PIRG) method. It is demonstrated that the system undergoes a first-order phase transition to the plaquette-singlet insulating phase at a finite Hubbard interaction. This conclusion is drawn via a detailed analysis of the spin and charge correlations around the phase transition point by means of the PIRG method aided with a new iteration scheme introduced in this paper.

arXiv:0808.1116•Journal of the Physical Society of Japan•Sep 25, 2008•18 citations
We investigate the bandwidth-controlled Mott transition in the Hubbard model on the checkerboard lattice at half filling using the path-integral renormalization group (PIRG) method. It is demonstrated that the system undergoes a first-order phase transition to the plaquette-singlet insulating phase at a finite Hubbard interaction. This conclusion is drawn via a detailed analysis of the spin and charge correlations around the phase transition point by means of the PIRG method aided with a new iteration scheme introduced in this paper.