Zero-bias tunneling anomaly in a clean 2D electron gas caused by smooth density variations

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dc.creatorSedrakyan, T. A.
dc.creatorMishchenko, E. G.
dc.creatorRaikh, M. E.
dc.date2007-02-10
dc.date2007-11-19
dc.date.accessioned2026-07-07T11:01:23Z
dc.date.available2026-07-07T11:01:23Z
dc.descriptionWe show that smooth variations, δn({\bf r}), of the local electron concentration in a clean 2D electron gas give rise to a zero-bias anomaly in the tunnel density of states, ν(ω), even in the absence of scatterers, and thus, without the Friedel oscillations. The energy width, ω_0, of the anomaly scales with the magnitude, δn, and characteristic spatial extent, D, of the fluctuations as (δn/D)^{2/3}, while the relative magnitude δν/νscales as (δn/D). With increasing ω, the averaged δνoscillates with ω. We demonstrate that the origin of the anomaly is a weak curving of the classical electron trajectories due to the smooth inhomogeneity of the gas. This curving suppresses the corrections to the electron self-energy which come from the virtual processes involving two electron-hole pairs
dc.description4+ pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0702252
dc.identifierhttp://arxiv.org/abs/cond-mat/0702252
dc.identifierPhys.Rev.Lett.99:206405,2007
dc.identifierdoi:10.1103/PhysRevLett.99.206405
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187934
dc.subjectMesoscale and Nanoscale Physics
dc.subjectHigh Energy Physics - Theory
dc.titleZero-bias tunneling anomaly in a clean 2D electron gas caused by smooth density variations
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