Many-body calculation of the surface-state energies for Si(111)2×1
- 28 January 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 66 (4), 500-503
- https://doi.org/10.1103/physrevlett.66.500
Abstract
The surface-state excitation energies for the Si(111)2×1 surface have been calculated in the GW approximation. The energy position and the dispersion of the occupied and empty surface states are in excellent agreement with photoemission and inverse-photoemission experiments. The calculated quasiparticle surface-state band gap, 0.62 eV, is 0.15 eV larger than the measured onset energy for electron-hole pair excitations. The possibility that excitonic effects are responsible for this difference is examined.Keywords
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