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 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.

arXiv comment4 pages, 4 figures

References in corpus (13)

• Ferromagnetic Semiconductors: Moving Beyond (Ga,Mn)As
• Effects of Disorder on Ferromagnetism in Diluted Magnetic Semiconductors
• Spatial structure of an individual Mn acceptor in GaAs
• Calculating the Curie Temperature reliably in diluted III-V ferromagnetic semiconductors
• Multiband tight-binding model of local magnetism in GaMnAs
• The local spectrum of a superconductor as a probe of interactions between magnetic impurities
• Correlated defects, metal-insulator transition, and magnetic order in ferromagnetic semiconductors
• Cross-sectional STM of Mn-doped GaAs: theory and experiment
• Effective Hamiltonian for Ga_{1-x}Mn_xAs in the Dilute Limit
• Spin-orientation-dependent spatial structure of a magnetic acceptor state in a zincblende semiconductor
• Disorder, spin-orbit, and interaction effects in dilute ${\mathrm{Ga}}_{1-x}{\mathrm{Mn}}_x\mathrm{As}$
• Imaging of the [Mn2+(3d5) + hole] complex in GaAs by Cross-sectional Scanning Tunneling Microscopy
• Charge manipulation and imaging of the Mn acceptor state in GaAs by Cross-sectional Scanning Tunneling Microscopy

Cited by in corpus (7)

• Atom-by-Atom Substitution of Mn in GaAs and Visualization of their Hole-Mediated Interactions
• Computational and experimental imaging of Mn defects on GaAs (110) cross-sectional surface
• Magnetic properties of substitutional Mn in (110) GaAs surface and subsurface layers
• Magnetic circular dichroism from the impurity band in III-V diluted magnetic semiconductors
• Magnetic interactions of substitutional Mn pairs in GaAs
• Chern number spins of Mn acceptor magnets in GaAs
• Electric manipulation of the Mn-acceptor binding energy and the Mn-Mn exchange interaction on the GaAs (110) surface by nearby As vacancies