The Mott metal-insulator transition in half-filled two-dimensional Hubbard models

The Mott metal-insulator transition in half-filled two-dimensional Hubbard models

We study the Mott transition in the two dimensional Hubbard model by using the variational cluster approximation. The transition potential obtained is roughly Uc ≈ 2 and 6 for square and triangular lattices, respectively. A comparison between results of this approximation and other quantum cluster m...

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Bibliographic Details
Main Author: Peyman Sahebsara
Format: Article
Language:English
Published: Isfahan University of Technology 2008-06-01
Series:Iranian Journal of Physics Research
Subjects:
Hubbard model
Mott transition
VCA
spectral function
density of states
quantum cluster methods
Online Access:http://ijpr.iut.ac.ir/browse.php?a_code=A-10-1-281&slc_lang=en&sid=1
Description
Summary:We study the Mott transition in the two dimensional Hubbard model by using the variational cluster approximation. The transition potential obtained is roughly Uc ≈ 2 and 6 for square and triangular lattices, respectively. A comparison between results of this approximation and other quantum cluster methods is presented. Our zero-temperature calculation at strong coupling show that the transition on the triangular and square lattices occur at lower values of compared with other numerical techniques such as DMFT, CDMFT, and DCA. We also study the thermodynamic limit by an extrapolation to infinite size.
ISSN:1682-6957

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