Record Details

Title:
From local to nonlocal correlations: The Dual Boson perspective
Affiliation(s):
EuXFEL staff, Other
Author group:
Theory
Keyword(s):
Topic:
Scientific area:
Abstract:
Extended dynamical mean-field theory (EDMFT) is insufficient to describe nonlocal effects in strongly correlated systems, since corrections to the mean-field solution are generally large. We present an efficient scheme for the construction of diagrammatic extensions of EDMFT that avoids the usual double-counting problem by using an exact change of variables (the Dual Boson formalism) to distinguish the correlations included in the dynamical mean-field solution and those beyond. With a computational efficiency comparable to the $EDMFT+GW$ approach, our scheme significantly improves on the charge order transition phase boundary in the extended Hubbard model.
Imprint:
American Physical Society, 2016
Journal Information:
Physical Review B, 94 (20), 205110 (2016)
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Language(s):
English
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