Abstract
Optical absorption of a cleaved surface of germanium shows a band at energies smaller than the gap, that is removed when the surface is oxidized. The band is assumed to be due to optical excitation of a surface state practically coincident with the top of the valence band to a set of states 0.16 eV below the bottom of the conduction band.
- Received 27 June 1965
DOI:https://doi.org/10.1103/PhysRevLett.21.1170
©1968 American Physical Society