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Issue Eur. Phys. J. Appl. Phys.
Volume 24, Number 1, October 2003
Page(s) 27 - 31
Section Physics of Energy Conversion\ and Coupled Phenomena
DOI 10.1051/epjap:2003057
Published online 03 September 2003

Eur. Phys. J. Appl. Phys. 24, 27-31 (2003)
DOI: 10.1051/epjap:2003057

Disordered junction arrays used for Coulomb blockade thermometry

Y. Yu and W.K. Chow

Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, P. R. China

yb.yu@polyu.edu.hk

(Received: 4 March 2003 / Received in final form: 17 May 2003 / Accepted: 12 June 2003 Published online: 3 September 2003 )

Abstract
A possible application of nanometer-sized junction arrays is to Coulomb blockade thermometry (CBT), although only highly disordered arrays can be fabricated at present. In this paper, the characteristics of CBT device with disordered arrays will be studied. Similar to what is observed for uniform arrays, there is a dip at zero bias voltage in the differential conductance of disordered arrays. However, the half-width V1/2 of the dip for one-dimensional disordered arrays is largely dispersed. This study suggests that better devices can be developed by connecting a number of one-dimensional arrays in parallel to form an array group. The dispersion of half-width is quite small with values of V1/2 close to a constant. Further, the effects of electromagnetic environment and low temperature on the half-width are investigated. Results are agreed with those observed experimentally, that for the effect of the environment is negligible for large arrays. The half-width of a disordered array may be bigger or smaller than the ideal value, depending on the extend of disorder.

PACS
73.23.Hk - Coulomb blockade; single-electron tunneling.
07.20.Dt - Thermometers.

© EDP Sciences 2003


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