Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-10-31
Phys. Rev. B 74, 235206 (2006)
Physics
Condensed Matter
Disordered Systems and Neural Networks
9 figures
Scientific paper
10.1103/PhysRevB.74.235206
We present results of conductance-noise experiments on disordered films of crystalline indium oxide with lateral dimensions 2microns to 1mm. The power-spectrum of the noise has the usual 1/f form, and its magnitude increases with inverse sample-volume down to sample size of 2microns, a behavior consistent with un-correlated fluctuators. A colored second spectrum is only occasionally encountered (in samples smaller than 40microns), and the lack of systematic dependence of non-Gaussianity on sample parameters persisted down to the smallest samples studied (2microns). Moreover, it turns out that the degree of non-Gaussianity exhibits a non-trivial dependence on the bias V used in the measurements; it initially increases with V then, when the bias is deeper into the non-linear transport regime it decreases with V. We describe a model that reproduces the main observed features and argue that such a behavior arises from a non-linear effect inherent to electronic transport in a hopping system and should be observed whether or not the system is glassy.
Kozub Veniamin I.
Orlyanchik Vladimir
Ovadyahu Zvi
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