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

doi:10.1103/PhysRevLett.95.256402

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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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

Original language	English
Article number	256402
Pages (from-to)	256402-1/4
Number of pages	4
Journal	Physical Review Letters
Volume	95
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.95.256402
Publication status	Published - 2005

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title = "Spatial Structure of Mn-Mn Acceptor Pairs in GaAs",

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",

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AU - Yakunin, A.M.

AU - Silov, A.Y.

AU - Koenraad, P.M.

AU - Tang, J.-M.

AU - Flatté, M.E.

AU - Roy, van, W.

AU - De Boeck, J.

AU - Wolter, J.H.

PY - 2005

Y1 - 2005

N2 - 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

AB - 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

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DO - 10.1103/PhysRevLett.95.256402

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SP - 256402-1/4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

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ER -

Spatial Structure of Mn-Mn Acceptor Pairs in GaAs

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