Abstract
On an interface state band is observed that descends from the surface-state band of the clean copper surface. This band exhibits a Moiré-pattern-induced one-dimensional band gap, which is accompanied by strong standing-wave patterns, as revealed in low-temperature scanning tunneling microscopy images. At NaCl island step edges, one can directly see the refraction of these standing waves, which obey Snell’s refraction law.
- Received 15 August 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.036803
©2004 American Physical Society