Surface states and origin of the Fermi level pinning on nonpolar [formula] surfaces

Ivanova, L.; Borisova, S.; Eisele, H.; Dähne, M.; Laubsch, A.; Ebert, Ph.
November 2008
Applied Physics Letters;11/10/2008, Vol. 93 Issue 19, p192110
Academic Journal
[formula] cleavage surfaces were investigated by cross-sectional scanning tunneling microscopy and spectroscopy. It is found that both the N and Ga derived intrinsic dangling bond surface states are outside of the fundamental band gap. Their band edges are both located at the [formula] point of the surface Brillouin zone. The observed Fermi level pinning at 1.0 eV below the conduction band edge is attributed to the high step and defect density at the surface but not to intrinsic surface states.


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