COMPARISON OF SINGLE-ELECTRON TRAPS IN THE SUPERCONDUCTING AND NORMALSTATES

Citation
Je. Lukens et al., COMPARISON OF SINGLE-ELECTRON TRAPS IN THE SUPERCONDUCTING AND NORMALSTATES, Physica. B, Condensed matter, 203(3-4), 1994, pp. 354-360
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0921-4526
Volume
203
Issue
3-4
Year of publication
1994
Pages
354 - 360
Database
ISI
SICI code
0921-4526(1994)203:3-4<354:COSTIT>2.0.ZU;2-4
Abstract
Traps, consisting of arrays of nano-scale aluminum tunnel junctions, h ave been shown to hold single electrons for over 10(4) s (limited by o bservation time) at 50 mK. The barrier Delta U to the change of the ch arge state of the trap has a measured value in the range of 5-10 K (co nsistent with calculations) for traps of seven junctions (in the norma l state) of capacitance C approximate to 150 aF. In the superconductin g state, the activation energy is increased by 2.6 +/- 0.4 K, equal to the superconducting energy gap of Al. The observed escape of a single electron from the trap is via thermal activation down to temperatures of 50 mK (where Delta U must be reduced to observe transitions).