Physics – Condensed Matter – Materials Science
Scientific paper
2005-05-23
Physics
Condensed Matter
Materials Science
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.95.256402
The local density of states of Mn-Mn pairs in GaAs is mapped with cross-sectional scanning tunneling microscopy and compared with theoretical calculations based on envelope-function and tight-binding models. These measurements and calculations show that the crosslike shape of the Mn-acceptor wavefunction in GaAs persists even at very short Mn-Mn spatial separations. The resilience of the Mn-acceptor wave-function to high doping levels suggests that ferromagnetism in GaMnAs is strongly influenced by impurity-band formation. The envelope-function and tight-binding models predict similarly anisotropic overlaps of the Mn wave-functions for Mn-Mn pairs. This anisotropy implies differing Curie temperatures for Mn $\delta$-doped layers grown on differently oriented substrates.
Boeck Joan de
Flatte' Michael E.
Koenraad P. M.
Roy Willem Van
Silov Yu. A.
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