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Spatial structure of an individual Mn acceptor in GaAs
A M Yakunin1, A Yu Silov, P M Koenraad
1COBRA Inter-University, Eindhoven University of Technology, P.O. Box 513, NL-5600MB Eindhoven, The Netherlands.
Physical Review Letters
|July 13, 2004
Abstract:
The wave function of a hole bound to an individual Mn acceptor in GaAs is spatially mapped by scanning tunneling microscopy at room temperature and an anisotropic, crosslike shape is observed. The spatial structure is compared with that from an envelope-function, effective mass model and from a tight-binding model. This demonstrates that anisotropy arising from the cubic symmetry of the GaAs crystal produces the crosslike shape for the hole wave function. Thus the coupling between Mn dopants in GaMnAs mediated by such holes will be highly anisotropic.