Spatial Structure of Mn-Mn Acceptor Pairs in GaAs

A.M. Yakunin, A.Y. Silov, P.M. Koenraad, J.-M. Tang, M.E. Flatté, W. Roy, van, J. De Boeck, J.H. Wolter

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The local density of states of Mn-Mn pairs in GaAs is mapped with cross-sectional scanning tunnelingmicroscopy and compared with theoretical calculations based on envelope-function and tight-bindingmodels. 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-acceptorwave function to high doping levels suggests that ferromagnetism in GaMnAs is strongly influenced byimpurity-band formation. The envelope-function and tight-binding models predict similarly anisotropicoverlaps of the Mn wave functions for Mn-Mn pairs. This anisotropy implies differing Curie temperaturesfor Mn -doped layers grown on differently oriented substrates
Original languageEnglish
Article number256402
Pages (from-to)256402-1/4
Number of pages4
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 2005


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