Linear-response dynamics from the time-dependent Gutzwiller approximation

  • Within a Lagrangian formalism, we derive the time-dependent Gutzwiller approximation for general multi-band Hubbard models. Our approach explicitly incorporates the coupling between time-dependent variational parameters and a time-dependent density matrix from which we obtain dynamical correlation functions in the linear-response regime. Our results are illustrated for the one-band model where we show that the interacting system can be mapped to an effective problem of fermionic quasiparticles coupled to 'doublon' (double occupancy) bosonic fluctuations. The latter have an energy on the scale of the on-site Hubbard repulsion U in the dilute limit but become soft at the Brinkman–Rice transition, which is shown to be related to an emerging conservation law of doublon charge and the associated gauge invariance. Coupling with the boson mode produces a structure in the charge response and we find that a similar structure appears in dynamical mean-field theory.

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Metadaten
Author: Jörg Bünemann, Michael Capone, José LorenzanaORCiD, Götz Seibold
URL:http://iopscience.iop.org/article/10.1088/1367-2630/15/5/053050
ISSN:1367-2630
Title of the source (English):New Journal of Physics
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2013
Volume/Year:15
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
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