Theory of Core-Level Photoemission and the X-ray Edge Singularity Across the Mott Transition

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dc.creatorCornaglia, P. S.
dc.creatorGeorges, A.
dc.date2006-07-26
dc.date2007-03-13
dc.date.accessioned2026-07-07T07:51:14Z
dc.date.available2026-07-07T07:51:14Z
dc.descriptionThe zero temperature core-level photoemission spectrum is studied across the metal to Mott insulator transition using dynamical mean-field theory and Wilson's numerical renormalization group. An asymmetric power-law divergence is obtained in the metallic phase with an exponent alpha(U,Q)-1 which depends on the strength of both the Hubbard interaction U and the core-hole potential Q. For Q <~ U_c/2 alpha decreases with increasing U and vanishes at the transition (U -> U_c) leading to a symmetric peak in the insulating phase. For Q >~ U_c/2, alpha remains finite close to the transition, but the integrated intensity of the power-law vanishes and there is no associated peak in the insulator. The weight and position of the remaining peaks in the spectra can be understood within a molecular orbital approach.
dc.description5 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0607693
dc.identifierhttp://arxiv.org/abs/cond-mat/0607693
dc.identifierPhys. Rev. B 75, 115112 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.115112
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/125443
dc.subjectStrongly Correlated Electrons
dc.titleTheory of Core-Level Photoemission and the X-ray Edge Singularity Across the Mott Transition
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