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arXiv · 1109.5848

Temporal universal conductance fluctuations in RuO$_2$ nanowires due to mobile defects

An-Shao Lien·L. Y. Wang·C. S. Chu·Juhn-Jong Lin
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Abstract

Temporal universal conductance fluctuations (TUCF) are observed in RuO$_2$ nanowires at cryogenic temperatures. The fluctuations persist up to very high $T \sim 10$ K. Their root-mean-square magnitudes increase with decreasing $T$, reaching $\sim 0.2 e^2/h$ at $T \lesssim 2$ K. These fluctuations are shown to originate from scattering of conduction electrons with rich amounts of mobile defects in artificially synthesized metal oxide nanowires. TUCF characteristics in both one-dimensional saturated and unsaturated regimes are identified and explained in terms of current theories. Furthermore, the TUCF as a probe for the characteristic time scales of the mobile defects (two-level systems) are discussed.

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An-Shao Lien, L. Y. Wang, C. S. Chu, Juhn-Jong Lin. 2011-09-27. Temporal universal conductance fluctuations in RuO$_2$ nanowires due to mobile defects. https://doi.org/10.1103/physrevb.84.155432

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