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Phys. Rev. B 64, 033311 (2001) [4 pages]

Band structure and optical properties of germanium sheet polymers

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Zoltán Hajnal1,2, Günther Vogg3, Lex J.-P. Meyer3, Bernadett Szűcs4, Martin S. Brandt3, and Thomas Frauenheim1
1Department of Theoretical Physics, University of Paderborn, Warburger Strasse 100, D-33095 Paderborn, Germany
2MTA Research Institute for Technical Physics and Materials Science of the Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
3 Walter Schottky Institut, Technische Universität München, Am Coulombwall, D-85748 Garching, Germany
4Department of Atomic Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary

Received 23 April 2001; published 25 June 2001

The band structure of H-terminated Ge sheet polymers is calculated using density-functional theory in the local density approximation and compared to the optical properties of epitaxial polygermyne layers as determined from reflection, photoluminescence, and photoluminescence excitation measurements. A direct band gap of 1.7 eV is predicted and a near resonant excitation of the photoluminescence is observed experimentally close to this energy.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e033311
DOI: 10.1103/PhysRevB.64.033311
PACS: 78.20.Bh, 73.20.At, 78.55.-m, 78.66.-w

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