Dynamical effects and conductance asymmetry in metal-insulator-metal systems with different electrodes

Tokić, B. and Šestović, D. and Marušić, Leonardo and Šunjić, Marijan (1999) Dynamical effects and conductance asymmetry in metal-insulator-metal systems with different electrodes. Physical Review B, 60 (11). pp. 8368-8372. ISSN 1098-0121

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Abstract

We investigated the electron tunneling process in a planar system consisting of two semi-infinite metal electrodes of different dielectric properties separated by a narrow vacuum gap. This system can be viewed as a model of a metal-insulator-metal structure, or even as a very rough model of scanning tunneling microscopy. We used a local limit of a self-consistent dynamic calculation to evaluate effective tunneling barriers, and discussed the influence of different screening properties of the metallic electrodes on these barriers as well as on the conductance. We found that the barriers are significantly additionally lowered due to the difference in the charge fluctuation frequencies of the electrodes, and that the conductance minimum in such systems is shifted to a nonzero value. We compared our results with some measurements of I-V characteristics and work functions and found that our calculations contribute to the understanding of the observed conductance asymmetry.

Item Type: Article
Keywords: M-I-M system, plasmon, conductance
Date: 1999
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1999) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119206
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 May 2014 08:58
Last Modified: 12 May 2014 08:58
URI: http://digre.pmf.unizg.hr/id/eprint/1157

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