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Título

Time evolution of excitations in normal Fermi liquids

Autor Pavlyukh, Y.; Rubio, Angel; Berakdar, J.
Fecha de publicación 2013
EditorAmerican Physical Society
Citación Physical Review B 87: 205124 (2013)
ResumenWe inspect the initial and the long-time evolution of excitations in Fermi liquids by analyzing the time structure of the electron spectral function. Focusing on the short-time limit we study the electron-boson model for the homogeneous electron gas and apply the first-order (in boson propagator) cumulant expansion of the electron Green's function. In addition to a quadratic decay in time upon triggering the excitation, we identify nonanalytic terms in the time expansion similar to those found in the Fermi edge singularity phenomenon. We also demonstrate that the exponential decay in time in the long-time limit is inconsistent with the GW approximation for the self-energy. The background for this is the Paley-Wiener theorem of complex analysis. To reconcile with the Fermi liquid behavior an inclusion of higher order diagrams (in the screened Coulomb interaction) is required.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.87.205124
URI http://hdl.handle.net/10261/95096
DOI10.1103/PhysRevB.87.205124
Identificadoresdoi: 10.1103/PhysRevB.87.205124
issn: 1098-0121
e-issn: 1550-235X
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