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2000

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/10600

Anomalous crossover between thermal and shot noise in macroscopic diffusive conductors

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http://dx.doi.org/10.1103/PhysRevB.62.8068

Abstract

We predict the existence of an anomalous crossover between thermal and shot noise in macroscopic diffusive conductors. We first show that, besides thermal noise, these systems may also exhibit shot noise due to fluctuations of the total number of carriers in the system. Then we show that at increasing currents the crossover between the two noise behaviors is anomalous, in the sense that the low-frequency current spectral density displays a region with a superlinear dependence on the current up to a cubic law. The anomaly is due to the nontrivial coupling in the presence of the long-range Coulomb interaction among the three time scales relevant to the phenomenon, namely, diffusion, transit, and dielectric relaxation time.

Subject

Soroll electrònic, Fluctuations (Physics), Semiconductors

Subject (English)

Electronic noise, Fluctuations (Physics), Semiconductors

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Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

Citation

GOMILA LLUCH, Gabriel and REGGIANI, L. (Lino). Anomalous crossover between thermal and shot noise in macroscopic diffusive conductors. Physical Review B. 2000. Vol. 62, num. 12, pags. 8068-8071. ISSN 0163-1829. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/10600

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