Edge state on hydrogen-terminated graphite edges investigated by scanning tunneling microscopy

Details Edge state on hydrogen-terminated graphite edges investigated by scanning tunneling microscopy Edge state on hydrogen-terminated graphite edges investigated by scanning tunneling microscopy

2006-02-16

arxiv.org/abs/cond-mat/0602378v1

Physics

Condensed Matter

Materials Science

9 pages, 11 figures, accepted for Physical Review B

Scientific paper

10.1103/PhysRevB.73.125415

The edge states that emerge at hydrogen-terminated zigzag edges embedded in dominant armchair edges of graphite are carefully investigated by ultrahigh-vacuum scanning tunneling microscopy (STM) measurements. The edge states at the zigzag edges have different spatial distributions dependent on the $\alpha$- or $\beta$-site edge carbon atoms. In the case that the defects consist of a short zigzag (or a short Klein) edge, the edge state is present also near the defects. The amplitude of the edge state distributing around the defects in an armchair edge often has a prominent hump in a direction determined by detailed local atomic structure of the edge. The tight binding calculation based on the atomic arrangements observed by STM reproduces the observed spatial distributions of the local density of states.

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