1. Electronic Transport on the Nanoscale: Ballistic Transmission and Ohmâs Law.
- Author
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J. Homoth, M. Wenderoth, T. Druga, L. Winking, R. G. Ulbrich, C. A. Bobisch, B. Weyers, A. Bannani, E. Zubkov, A. M. Bernhart, M. R. Kaspers, and R. MoÌller
- Subjects
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ELECTRON transport , *NANOSTRUCTURED materials , *OHM'S law , *ELECTRICAL conductors , *PHONON scattering , *NUMERICAL analysis - Abstract
If a current of electrons flows through a normal conductor (in contrast to a superconductor), it is impeded by local scattering at defects as well as phonon scattering. Both effects contribute to the voltage drop observed for a macroscopic complex system as described by Ohmâs law. Although this concept is well established, it has not yet been measured around individual defects on the atomic scale. We have measured the voltage drop at a monatomic step in real space by restricting the current to a surface layer. For the Si(111)â(â3 Ã â3)âAg surface a monotonous transition with a width below 1 nm was found. A numerical analysis of the data maps the current flow through the complex network and the interplay between defect-free terraces and monatomic steps. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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