Phys. Rev. Lett. 92, 036803 (2004) [4 pages]Snell’s Law for Surface Electrons: Refraction of an Electron Gas Imaged in Real SpaceReceived 15 August 2003; published 22 January 2004 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 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.036803
DOI:
10.1103/PhysRevLett.92.036803
PACS:
73.20.At, 68.37.Ef, 73.61.Ng
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