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Title: Lower and upper Hubbard bands: A slave-boson treatment
Authors: Raimondi, Roberto
Castellani, Claudio
Keywords: Strongly correlated electron systems
Hubbard model
metal-insulator transition
slave-boson approach
Issue Date: 1993
Publisher: American Physical Society
Source: 10
Abstract: We analyze the single-particle spectral density and the optical conductivity of the single-band Hubbard model in the insulating Mott phase within the slave-boson technique. We show that the boson fluctuations around the saddle-point solution build up the lower and upper Hubbard bands and give rise to the optical conductivity which describes transitions between these incoherent bands. We find that the Brinkman-Rice metal-insulator transition is characterized by the simultaneous vanishing of the jump in the chemical potential, the single-particle spectral density gap, and the optical gap.
ISSN: 1550-235x
DOI: 10.1103/PhysRevB.48.11453
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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