Electronic States and Magnetism of Mn Impurities and Dimers in Narrow-Gap and Wide-Gap III-V Semiconductors

Abstract

Electronic states and magnetic properties of single $Mn$ impurity and dimer doped in narrow-gap and wide-gap $III$-$V$ semiconductors have been studied systematically. It has been found that in the ground state for single $Mn$ impurity, $Mn$-$As(N)$ complex is antiferromagnetic (AFM) coupling when $p$-$d$ hybridization $V_{pd}$ is large and both the hole level $E_v$ and the impurity level $E_d$ are close to the midgap; or very weak ferromagnetic (FM) when $V_{pd}$ is small and both $E_v$ and $E_d$ are deep in the valence band. In $Mn$ dimer situation, the $Mn$ spins are AFM coupling for half-filled or full-filled $p$ orbits; on the contrast, the Mn spins are double-exchange-like FM coupling for any $p$-orbits away from half-filling. We propose the strong {\it p-d} hybridized double exchange mechanism is responsible for the FM order in diluted $III$-$V$ semiconductors.

References in corpus (12)

• Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors
• Polaron percolation in diluted magnetic semiconductors
• First principles study of the origin and nature of ferromagnetism in (Ga,Mn)As
• Theory of Diluted Magnetic Semiconductor Ferromagnetism
• Giant Magnetic Moments of Nitrogen Stabilized Mn Clusters and Their Relevance to Ferromagnetism in Mn Doped GaN
• First-principles investigation of the assumptions underlying Model-Hamiltonian approaches to ferromagnetism of 3d impurities in III-V semiconductors
• A disordered RKKY lattice mean field theory for ferromagnetism in diluted magnetic semiconductors
• Double exchange mechanisms for Mn doped III-V ferromagnetic semiconductors
• Spectroscopic determination of hole density in the ferromagnetic semiconductor Ga${}_{1-x}$Mn${}_x$As
• Electronic structure of In${}_{1-x}$Mn${}_x$As studied by photoemission spectroscopy: Comparison with Ga${}_{1-x}$Mn${}_x$As
• Photoemission studies of Ga${}_{1-x}$Mn${}_x$As: Mn-concentration dependent properties
• Carrier induced ferromagnetism in concentrated and diluted local-moment systems

Cited by in corpus (1)

• Origin of low-temperature magnetic ordering in Ga1-xMnxN