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# Universal Conductance Fluctuations in Three Dimensional Metallic Single Crystals of Si

Ghosh, Arindam and Raychaudhuri, AK (2000) Universal Conductance Fluctuations in Three Dimensional Metallic Single Crystals of Si. In: Physical Review Letters, 84 (20). pp. 4681-4684.

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## Abstract

In this paper we report the measurement of conductance fluctuations in 3D crystals of Si made metallic by heavy doping. $(L/L_\phi \sim10^3$ , where $L_\phi$ is the phase coherence length.) Temperature and magnetic field dependence of noise strongly indicate the universal conductance fluctuations as a predominant source of the observed magnitude of noise. Conductance fluctuations within a single phase coherent region of $L^3 _\phi$ were found to be saturated at $<( \delta G_\phi)^2 >$ $\approx$ $(e^2 /h)^2$. An accurate knowledge of the level of disorder enables us to calculate the change in conductance $\delta G_1$ due to movement of a single scatterer as $<(\delta G_1)^2 >$ ~ $(e^2 /h)^2$, which is ~2 orders of magnitude higher than its theoretically expected value in 3D systems.

Item Type: Journal Article Copyright of this article belongs to American Physical Society. Division of Physical & Mathematical Sciences > Physics 07 Jul 2006 19 Sep 2010 04:30 http://eprints.iisc.ernet.in/id/eprint/7962

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