Published in Phys. Rev. B 64, 081306(R) (2001).

Buckling and band gap of the Ge(111)2x1 surface studied by low-temperature scanning tunneling microscopy

R. M. Feenstra,* G. Meyer,** F. Moresco,** and K. H. Rieder**
*Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213
**Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195 Berlin, Germany


Low-temperature scanning tunneling microscopy is used to study the 2x1 reconstruction of cleaved Ge(111) surfaces. Buckling of the surface atoms is investigated by observations of the corrugation shift between filled and empty states. In the < 2 -1 -1 > direction, the shift in corrugation maxima from filled to empty states is found to be negative, consistent with expectations for the "negatively buckled" model for this surface. A surface band gap of 0.54 +/- 0.04 eV is measured by tunneling spectroscopy.

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