Excitonic giant Zeeman effect in GaN:Mn^3+

Abstract

We describe a direct observation of the excitonic giant Zeeman splitting in (Ga,Mn)N, a wide-gap III-V diluted magnetic semiconductor. Reflectivity and absorption spectra measured at low temperatures display the A and B excitons, with a shift under magnetic field due to s,p-d exchange interactions. Using an excitonic model, we determine the difference of exchange integrals between Mn^3+ and free carriers in GaN, N_0(alpha-beta)=-1.2 +/- 0.2 eV. Assuming a reasonable value of alpha, this implies a positive sign of beta which corresponds to a rarely observed ferromagnetic interaction between the magnetic ions and the holes.

4 pages, 4 figures

References in corpus (4)

• Effect of the s,p-d exchange interaction on the excitons in (Zn,Co)O epilayers
• High-energy spectroscopic study of the III-V nitride-based diluted magnetic semiconductor Ga${}_{1-x}$Mn${}_x$N
• Antiferromagnetic s-d exchange coupling in GaMnAs
• Magneto-optical spectroscopy of (Ga,Mn)N epilayers

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• Fe dopant in ZnO: 2+ vs 3+ valency and ion-carrier s,p-d exchange interaction
• Effects related to deposition temperature of ZnCoO films grown by Atomic Layer Deposition - uniformity of Co distribution, structural, optical, electrical and magnetic properties
• Upper bound for the s-d exchange integral in n-(Ga,Mn)N:Si from magnetotransport studies
• Relation between exciton splittings, magnetic circular dichroism, and magnetization in wurtzite (Ga,Fe)N
• Magneto-Optical Effects Enhancement in DMS Layers Utilizing 1-D Photonic Crystal
• Determination of the Fermi Level Position in Dilute Magnetic Ga${}_{1-x}$Mn${}_x$N Films
• Tunnelling of a composite particle in presence of a magnetic field