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Single-site and cellular dynamical mean-field theory of the Anderson-Hubbard model

Title
Single-site and cellular dynamical mean-field theory of the Anderson-Hubbard model
Authors
Go A.Jeon G.S.
Ewha Authors
전건상
SCOPUS Author ID
전건상scopus
Issue Date
2013
Journal Title
Journal of the Korean Physical Society
ISSN
0374-4884JCR Link
Citation
vol. 62, no. 5, pp. 775 - 780
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
We study the Anderson-Hubbard model to examine the interplay between the disordered potential and the Hubbard interactions. We use the dynamical mean-field theory (DMFT) with an exact diagonalization as an impurity solver to effectively deal with the quantum fluctuations due to the local interactions. In order to characterize the paramagnetic metal-insulator transition in disordered systems, we compute the typical local density of states, as well as the arithmetically-averaged local density of states. Our approach is found to reproduce the characteristic features of the metal-insulator transition in infinite dimensions, such as the existence of the disorder-driven metallic phase for moderate values of disorder strength and interactions, as observed in earlier studies. In two dimensions, the system turns out to exhibit more insulating behavior when we increase the cluster size in the cellular DMFT. The metallic phase, which is induced from weak Mott insulators by the introduction of a disordered potential, is not observed in two dimensions. © 2013 The Korean Physical Society.
DOI
10.3938/jkps.62.775
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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