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Phys. Rev. B 64, 081306(R) (2001) [4 pages]

Buckling and band gap of the Ge(111)2×1 surface studied by low-temperature scanning tunneling microscopy

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R. M. Feenstra*
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213

G. Meyer†, F. Moresco, and K. H. Rieder
Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Received 21 March 2001; published 7 August 2001

Low-temperature scanning tunneling microscopy is used to study the 2×1 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 〈21¯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.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.081306
DOI:
10.1103/PhysRevB.64.081306
PACS:
68.35.Bs, 68.37.Ef, 73.20.At

*Email address: feenstra@andrew.cmu.edu

†Present address: Paul Drude Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany.

 
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