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Percolating through networks of random thresholds: Finite temperature electron tunneling in metal nanocrystal arrays

Parthasarathy, Raghuveer and Lin, Xiao-Min and Elteto, Klara and Rosenbaum, T. F. and Jaeger, Heinrich M. (2004) Percolating through networks of random thresholds: Finite temperature electron tunneling in metal nanocrystal arrays. Physical Review Letters, 92 (7). Art. No. 076801. ISSN 0031-9007. doi:10.1103/PhysRevLett.92.076801.

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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 crossover 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^∗.

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Additional Information:© 2004 The American Physical Society. (Received 17 February 2003; published 18 February 2004). We thank Qiti Guo and Benjamin Lauderdale for experimental assistance and Eduard Antonyan, Terry Bigioni, Ilya Gruzberg, Alan Middleton, Toan Nguyen, and Tom Witten for stimulating discussions. X.-M. L. acknowledges support from DOE W-31-109-ENG-38. This work was supported by the UC-ANL Consortium for Nanoscience Research and by the NSF MRSEC program under DMR-0213745.
Funding AgencyGrant Number
Department of Energy (DOE)W-31-109-ENG-38
Consortium for Nanoscience ResearchUNSPECIFIED
Issue or Number:7
Classification Code:PACS numbers: 73.22.–f, 05.60.Gg, 73.21.Cd, 73.40.Gk
Record Number:CaltechAUTHORS:20140707-163028858
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46955
Deposited By: George Porter
Deposited On:14 Jul 2014 17:07
Last Modified:10 Nov 2021 17:32

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