Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-02-18
Phys. Rev. Lett. 92, 076801 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages including 3 figures; replaced 3/30/04: minor changes; final version
Scientific paper
10.1103/PhysRevLett.92.076801
We investigate how temperature affects transport through large networks of nonlinear conductances with distributed thresholds. In monolayers of weakly-coupled gold nanocrystals, quenched charge disorder produces a range of local thresholds for the onset of electron tunneling. Our measurements delineate two regimes separated by a cross-over temperature $T^*$. Up to $T^*$ the nonlinear zero-temperature shape of the current-voltage curves survives, but with a threshold voltage for conduction that decreases linearly with temperature. Above $T^*$ the threshold vanishes and the low-bias conductance increases rapidly with temperature. We develop a model that accounts for these findings and predicts $T^*$.
Elteto Klara
Jaeger Heinrich M.
Lin Xiao-Min
Parthasarathy Raghuveer
Rosenbaum Thomas F.
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