Super-poissonian noise, negative differential conductance, and relaxation effects in transport through molecules, quantum dots and nanotubes

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dc.creatorThielmann, A.
dc.creatorHettler, M. H.
dc.creatorKönig, J.
dc.creatorSchön, G.
dc.date2004-06-25
dc.date2004-07-12
dc.date.accessioned2026-07-07T06:20:18Z
dc.date.available2026-07-07T06:20:18Z
dc.descriptionWe consider charge transport through a nanoscopic object, e.g. single molecules, short nanotubes, or quantum dots, that is weakly coupled to metallic electrodes. We account for several levels of the molecule/quantum dot with level-dependent coupling strengths, and allow for relaxation of the excited states. The current-voltage characteristics as well as the current noise are calculated within first-order perturbation expansion in the coupling strengths. For the case of asymmetric coupling to the leads we predict negative-differential-conductance accompanied with super-poissonian noise. Both effects are destroyed by fast relaxation processes. The non-monotonic behavior of the shot noise as a function of bias and relaxation rate reflects the details of the electronic structure and level-dependent coupling strengths.
dc.description8 pages, 7 figures, submitted to Phys. Rev. B, added references
dc.identifierhttps://arxiv.org/abs/cond-mat/0406647
dc.identifierhttp://arxiv.org/abs/cond-mat/0406647
dc.identifierPRB 71, 045341 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.045341
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95290
dc.subjectMesoscale and Nanoscale Physics
dc.titleSuper-poissonian noise, negative differential conductance, and relaxation effects in transport through molecules, quantum dots and nanotubes
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