Electronic surface states at steps in Si(111)2 x 1 - Chiaradia, P.; Chiarotti, G.; Selci, S.; Zhi-Ji, Z. (Elsevier)
Step-related surface states in Si(111)2 x 1 are investigated by optical reflectivity. Transitions involving these states occur at 0.35 eV, while terrace-states give rise to the well known peak at 0.45 eV. The experimental data point out that occupied surface states related to steps have a slightly higher energy than terrace-states and therefore they should play a role in the Fermi level pinning.
http://linkinghub.elsevier.com/retrieve/pii/0039-6028(83)90530-7
Keywords: U