Snell's law for surface electrons: Refraction of an electron gas imaged in real space
arXiv:cond-mat/0311415 · doi:10.1103/PhysRevLett.92.036803
Abstract
On NaCl(100)/Cu(111) an interface state band is observed that descends from the surface-state band of the clean copper surface. This band exhibits a Moire-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.
4 pages, 4 figures