Theory and observation of highly asymmetric atomic structure in scanning-tunneling-microscopy images of graphite

David Tomnek, Steven G. Louie, H. Jonathon Mamin, David W. Abraham, Ruth Ellen Thomson, Eric Ganz, John Clarke

Research output: Contribution to journalArticlepeer-review

249 Scopus citations

Abstract

Images of the (0001) surface of graphite observed in the scanning-tunneling microscope (STM) show a strong asymmetry in the tunneling current between neighboring carbon atoms in the hexagonal ring. The magnitude of this asymmetry is seen to be almost independent of the polarity and to decrease slightly with increasing amplitude of the bais voltage for voltages below 1 V. A theory is developed that explains this anomaly as a purely electronic effect, arising from the symmetry of the states scanned by the STM, which dominates over the topography of graphite. The predicted trends for the bias-voltage dependence of the asymmetry are confirmed experimentally.

Original languageEnglish (US)
Pages (from-to)7790-7793
Number of pages4
JournalPhysical Review B
Volume35
Issue number14
DOIs
StatePublished - 1987
Externally publishedYes

Fingerprint Dive into the research topics of 'Theory and observation of highly asymmetric atomic structure in scanning-tunneling-microscopy images of graphite'. Together they form a unique fingerprint.

Cite this