期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 47, 页码 19097-19102出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1208699109
关键词
atomic force microscopy; surface science
资金
- Natural Sciences and Engineering Research Council of Canada
- le Fonds Quebecois de le Recherche sur la Nature et les Technologies
- Canadian Institute for Advanced Research
A mechanically formed electrical nanocontact between gold and tungsten is a prototypical junction between metals with dissimilar electronic structure. Through atomically characterized nanoindentation experiments and first-principles quantum transport calculations, we find that the ballistic conduction across this intermetallic interface is drastically reduced because of the fundamental mismatch between swave-likemodes of electron conduction in the gold and d wave-like modes in the tungsten. The mechanical formation of the junction introduces defects and disorder, which act as an additional source of conduction losses and increase junction resistance by up to an order of magnitude. These findings apply to nanoelectronics and semiconductor device design. The technique that we use is very broadly applicable to molecular electronics, nanoscale contact mechanics, and scanning tunneling microscopy.
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