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Conductance noise spectrum of mesoscopic systems

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Zeitschrift für Physik B Condensed Matter

Abstract

We investigate the shape as well as the size- and temperature-dependence of the conductance noise spectrum of a small system containing electrons and both fixed and mobile scatterers. If the number of mobile scatterers within a phase-coherent region is sufficiently large, the temporal variation of the conductance can be viewed as a random walk process limited by the universal conductance fluctuations, resulting in a practically Lorentzian power spectrum. We discuss the conditions under which the noise spectrum of a system consisting of many phase-coherent regions is either Lorentzian or 1/f-like. The temperature-dependence of the power spectrum is determined by the hopping mechanism and the variation of the phase breaking length. As a function of temperature the spectrum satisfies power law scaling relations with exponents depending on the dimension and the temperature range; the spectral intensity can both increase and decrease with decreasing temperature.

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Author notes

  1. László B. Kiss

    Present address: Institute of Experimental Physics, University of Szeged, Dóm tér 9, H-6720, Szeged, Hungary

  2. János Kertész

    Present address: Institute for Technical Physics, HAS, H-1325, Budapest, Hungary

Authors and Affiliations

  1. Institut für Theoretische Physik, Universität zu Köln, Zülpicherrstrasse 77, D-5000, Köln 41, Germany

    László B. Kiss, János Kertész & János Hajdu

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  1. László B. Kiss
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  2. János Kertész
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  3. János Hajdu
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Kiss, L.B., Kertész, J. & Hajdu, J. Conductance noise spectrum of mesoscopic systems. Z. Physik B - Condensed Matter 81, 299–303 (1990). https://doi.org/10.1007/BF01309362

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  • DOI: https://doi.org/10.1007/BF01309362

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