Divergent precursors of the Mott-Hubbard transition at the two-particle level.
Phys Rev Lett
; 110(24): 246405, 2013 Jun 14.
Article
em En
| MEDLINE
| ID: mdl-25165946
ABSTRACT
Identifying the fingerprints of the Mott-Hubbard metal-insulator transition may be quite elusive in correlated metallic systems if the analysis is limited to the single particle level. However, our dynamical mean-field calculations demonstrate that the situation changes completely if the frequency dependence of the two-particle vertex functions is considered The first nonperturbative precursors of the Mott physics are unambiguously identified well inside the metallic regime by the divergence of the local Bethe-Salpeter equation in the charge channel. In the low-temperature limit this occurs for interaction values where incoherent high-energy features emerge in the spectral function, while at high temperatures it is traceable up to the atomic limit.
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2013
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Article