Physics – Condensed Matter – Materials Science
Scientific paper
2011-05-11
Physics
Condensed Matter
Materials Science
8 pages, 8 figures
Scientific paper
This work presents results of near-band gap magnetooptical studies on (Zn,Mn)O epitaxial layers. We observe excitonic transitions in reflectivity and photoluminescence, that shift towards higher energies when the Mn concentration increases and split nonlinearly under the magnetic field. Excitonic shifts are determined by the s,p-d exchange coupling to magnetic ions, by the electron-hole s-p exchange, and the spin-orbit interactions. A quantitative description of the magnetoreflectivity findings indicates that the free excitons A and B are associated with the Gamma_7 and Gamma_9 valence bands, respectively, the order reversed as compared to wurtzite GaN. Furthermore, our results show that the magnitude of the giant exciton splittings, specific to dilute magnetic semiconductors, is unusual: the magnetoreflectivity data is described by an effective exchange energy N_0(beta-alpha)=+0.2+/-0.1 eV, what points to small and positive N_0 beta. It is shown that both the increase of the gap with x and the small positive value of the exchange energy N_0 beta corroborate recent theory describing the exchange splitting of the valence band in a non-perturbative way, suitable for the case of a strong p-d hybridization.
Chikoidze E.
Cibert Joel
Deparis C.
Dietl Tomasz
Dumont Y.
No associations
LandOfFree
Influence of s,p-d and s-p exchange couplings on exciton splitting in (Zn,Mn)O does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Influence of s,p-d and s-p exchange couplings on exciton splitting in (Zn,Mn)O, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Influence of s,p-d and s-p exchange couplings on exciton splitting in (Zn,Mn)O will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-610932