Dynamical effects and conductance asymmetry in metal-insulator-metal systems with different electrodes
| Autor: | Dragan Šestović, Marijan Šunjić, Leonardo Marušić, B. Tokić |
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| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
Materials science
Condensed matter physics M-I-M system Scanning tunneling spectroscopy plasmon conductance Conductance Spin polarized scanning tunneling microscopy Dielectric NATURAL SCIENCES. Physics law.invention PRIRODNE ZNANOSTI. Fizika law Electrode Quasiparticle Scanning tunneling microscope Quantum tunnelling |
| Zdroj: | Physical review B: Condensed matter and materials physics Volume 60 Issue 11 |
| ISSN: | 1098-0121 1550-235X |
| DOI: | 10.1103/PhysRevB.60.8368 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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