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arXiv · 0710.0365

Large oscillating non-local voltage in multi-terminal single wall carbon nanotube devices

G. Gunnarsson·J. Trbovic·C. Schonenberger
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Abstract

We report on the observation of a non-local voltage in a ballistic one-dimensional conductor, realized by a single-wall carbon nanotube with four contacts. The contacts divide the tube into three quantum dots which we control by the back-gate voltage $V_g$. We measure a large \emph{oscillating} non-local voltage $V_{nl}$ as a function of $V_g$ with zero mean. Though a classical resistor model can account for a non-local voltage including change of sign, it fails to describe the magnitude properly. The large amplitude of $V_{nl}$ is due to quantum interference effects and can be understood within the scattering-approach of electron transport.

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G. Gunnarsson, J. Trbovic, C. Schonenberger. 2007-12-15. Large oscillating non-local voltage in multi-terminal single wall carbon nanotube devices. https://doi.org/10.1103/physrevb.77.201405

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