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25 Dec 2000

Volume 77, Issue 26, pp. 4247-4436

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Measurements of discrete electronic states in a gold nanoparticle using tunnel junctions formed from self-assembled monolayers

Jason R. Petta, D. G. Salinas, and D. C. Ralph

Appl. Phys. Lett. 77, 4419 (2000); http://dx.doi.org/10.1063/1.1333396 (3 pages) | Cited 11 times

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We present results from nanometer-scale tunnel junctions fabricated using organic self-assembled monolayers (SAMs) as tunnel barriers. Single junctions have resistances consistent with tunneling through a single layer of molecules. In several devices, a gold nanoparticle nucleated within the SAM barrier. Such samples allow a sensitive test of mechanical stability—some are sufficiently stable to permit the observation of electron tunneling through individual electron-in-a-box states at low voltages and mK temperatures. We also observe anomalous transport characteristics at larger voltages, which may be due to the motion of the gold nanoparticle within the monolayer. © 2000 American Institute of Physics.
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73.22.-f Electronic structure of nanoscale materials and related systems
71.20.Be Transition metals and alloys
73.23.Hk Coulomb blockade; single-electron tunneling

Thermal fluctuation noise in a voltage biased superconducting transition edge thermometer

H. F. C. Hoevers, A. C. Bento, M. P. Bruijn, L. Gottardi, M. A. N. Korevaar, W. A. Mels, and P. A. J. de Korte

Appl. Phys. Lett. 77, 4422 (2000); http://dx.doi.org/10.1063/1.1336550 (3 pages) | Cited 26 times

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The current noise at the output of a microcalorimeter with a voltage biased superconducting transition edge thermometer is studied in detail. In addition to the two well-known noise sources: thermal fluctuation noise from the heat link to the bath and Johnson noise from the resistive thermometer, a third noise source strongly correlated with the steepness of the thermometer is required to fit the measured noise spectra. Thermal fluctuation noise, originating in the thermometer itself, fully explains the additional noise. A simple model provides quantitative agreement between the observed and calculated noise spectra for all bias points in the superconducting transition. © 2000 American Institute of Physics.
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07.20.Dt Thermometers
74.40.-n Fluctuation phenomena
85.25.-j Superconducting devices
07.20.Fw Calorimeters
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