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- W3100228979 abstract "We investigate the mesoscopic disorder induced rms conductance variance $delta G$ in a few layer graphene nanoribbon (FGNR) contacted by two superconducting (S) Ti/Al contacts. By sweeping the back-gate voltage, we observe pronounced conductance fluctuations superimposed on a linear background of the two terminal conductance G. The linear gate-voltage induced response can be modeled by a set of inter-layer and intra-layer capacitances. $delta G$ depends on temperature T and source-drain voltage $V_{sd}$. $delta G$ increases with decreasing T and $|V_{sd}|$. When lowering $|V_{sd}|$, a pronounced cross-over at a voltage corresponding to the superconducting energy gap $Delta$ is observed. For $|V_{sd}|ltequiv Delta$ the fluctuations are markedly enhanced. Expressed in the conductance variance $G_{GS}$ of one graphene-superconducutor (G-S) interface, values of 0.58 e^2/h are obtained at the base temperature of 230 mK. The conductance variance in the sub-gap region are larger by up to a factor of 1.4-1.8 compared to the normal state. The observed strong enhancement is due to phase coherent charge transfer caused by Andreev reflection at the nanoribbon-superconductor interface." @default.
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- W3100228979 date "2010-06-22" @default.
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- W3100228979 title "Superconductivity-enhanced conductance fluctuations in few-layer graphene" @default.
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- W3100228979 doi "https://doi.org/10.1088/0957-4484/21/27/274005" @default.
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