Spatial Structure of Mn-Mn Acceptor Pairs in GaAs

Authors :: Yakunin, A.M.
Silov, A.Y.
Koenraad, P.M.
Tang, J.-M.
Flatté, M.E.
Roy, van, W.
De Boeck, J.
Wolter, J.H.
Yakunin, A.M.
Silov, A.Y.
Koenraad, P.M.
Tang, J.-M.
Flatté, M.E.
Roy, van, W.
De Boeck, J.
Wolter, J.H.
Source :: Physical Review Letters vol.95 (2005) nr.25 p.256402-1/4 [ISSN 0031-9007]
Publication Year :: 2005
Abstract: 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

Database :: OAIster
Journal :: Physical Review Letters vol.95 (2005) nr.25 p.256402-1/4 [ISSN 0031-9007]
Notes :: Yakunin, A.M.
Publication Type :: Electronic Resource
Accession number :: edsoai.on1028688141
Document Type :: Electronic Resource