Reflectance anisotropy spectra of the diamond (100)-(2x1) surface: evidence of strongly bound surface state excitons.
We compare the results of ab initio calculations with measured reflection anisotropy spectra and show that strongly bound surface-state excitons occur on the clean diamond (100) surface. These excitons are found to have a binding energy close to 1 eV, the strongest ever observed at a semiconductor surface. Important electron-hole interaction effects on the line shape of the optical transitions above the surface-state gap are also found.
Palummo
Maurizia
M
Dipartimento di Fisica-Universitá di Roma, Tor Vergata and Istituto Nazionale per la Fisica della Materia, I-00133 Rome, Italy.
Pulci
Olivia
O
Del Sole
Rodolfo
R
Marini
Andrea
A
Schwitters
M
M
Haines
S R
SR
Williams
K H
KH
Martin
D S
DS
Weightman
P
P
Butler
J E
JE