Dynamical Exchange Effects in a Two-Dimensional Many-Polaron Gas

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dc.creatorHameeuw, K. J.
dc.creatorTempere, J.
dc.creatorBrosens, F.
dc.creatorDevreese, J. T.
dc.date2004-04-05
dc.date.accessioned2026-07-07T02:57:27Z
dc.date.available2026-07-07T02:57:27Z
dc.descriptionWe calculate the influence of dynamical exchange effects on the response properties and the static properties of a two-dimensional many-polaron gas. These effects are not manifested in the random-phase approximation which is widely used in the analysis of the many-polaron system. Here they are taken into account by using a dielectric function derived in the time-dependent Hartree-Fock formalism. At weak electron-phonon coupling, we find that dynamical exchange effects lead to substantial corrections to the random-phase approximation results for the ground state energy, the effective mass, and the optical conductivity of the polaron system. Furthermore, we show that the reduction of the spectral weight of the optical absorption spectrum at frequencies above the longitudinal optical phonon frequency, due to many-body effects, is overestimated by the random-phase approximation.
dc.description9 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0404101
dc.identifierhttp://arxiv.org/abs/cond-mat/0404101
dc.identifierEur. Phys. J. B 37, 447-452 (2004)
dc.identifierdoi:10.1140/epjb/e2004-00080-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23671
dc.subjectOther Condensed Matter
dc.titleDynamical Exchange Effects in a Two-Dimensional Many-Polaron Gas
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