We reformulate the time-dependent Gutzwiller approximation by M. Schir\'o and M. Fabrizio [Phys. Rev. Lett. 105, 076401 (2010)] in the framework of slave-boson mean-field theory, which is used to investigate the dynamical Mott transition of the generic two-band Hubbard model at half filling upon an interaction quench. Interorbital fluctuations lead to notable changes with respect to the single-band case. The singular dynamical transition is replaced by a broad regime of long-lived fluctuations between metallic and insulating states, accompanied by intriguing precursor behavior. A mapping to a spin model proves helpful to analyze the different regions in terms of the evolution of an Ising-like order parameter. Contrary to the static case, singlet occupations remain vital in the Mott-insulating regime with finite Hund's exchange.
Titolo: | Extended dynamic Mott transition in the two-band Hubbard model out of equilibrium |
Autori: | Behrmann, M.; Fabrizio, M.; Lechermann, F. |
Rivista: | |
Data di pubblicazione: | 2013 |
Volume: | 88 |
Fascicolo: | 3 |
Pagina iniziale: | 1 |
Pagina finale: | 5 |
Numero di Articolo: | 035116 |
Digital Object Identifier (DOI): | 10.1103/PhysRevB.88.035116 |
URL: | https://doi.org/10.1103/PhysRevB.88.035116 https://arxiv.org/abs/1304.6013 |
Appare nelle tipologie: | 1.1 Journal article |
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