Volume 79, Number 5, September 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 July 2007|
Optical gap between dangling-bond states of a single-domain diamond C(111)- by reflectance anisotropy spectroscopy
Dipartimento di Fisica and CNISM, Università di Roma “Tor Vergata” - Roma, Italy
2 School of Physics and Centre of Excellence in Strong Materials, University of the Witwatersrand - Johannesburg, Wits 2050, South Africa
Corresponding author: email@example.com
Accepted: 6 July 2007
The optical gap between dangling-bond states has been measured on a single-domain diamond C(111)- surface. The experimental result is 1.47 eV. Such a large surface gap (even larger if excitonic effects are considered) so far has not been obtained by state-of-the-art band calculations and its physical origin is still not elucidated. The experimental result suggests a strong electron-phonon interaction in this surface. The renormalization of the bare electronic transition energy by electron-phonon interaction provides a clue to solve the apparent disagreement between theory and experiment.
PACS: 78.68.+m – Optical properties of surfaces / 73.20.At – Surface states, band structure, electron density of states / 68.35.Bs – Structure of clean surfaces (reconstruction)
© Europhysics Letters Association, 2007
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