Effects ofs,p-dands-pexchange interactions probed by exciton magnetospectroscopy in (Ga,Mn)N
| Autor: | Thibaut Devillers, B. Faina, Alberta Bonanni, Jan Suffczyński, Andrea Navarro-Quezada, Andrzej Golnik, Andreas Grois, J. A. Gaj, Wojciech Pacuski |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Zeeman effect Photoluminescence Condensed matter physics Band gap Exciton 02 engineering and technology Magnetic semiconductor 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake Paramagnetism 0103 physical sciences symbols 010306 general physics 0210 nano-technology Spin (physics) Wurtzite crystal structure |
| Zdroj: | Physical Review B. 83 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.83.094421 |
| Popis: | Near band-gap photoluminescence and reflectivity in magnetic field are employed to determine the exchange-induced splitting of free exciton states in paramagnetic wurtzite Ga1-xMnxN, x < 1%, grown on sapphire substrates by metal-organic vapor phase epitaxy. The band gap is found to increase with x. The giant Zeeman splitting of all three excitons A, B and C is resolved, enabling the determination of the apparent exchange integrals N0alpha(app) = 0.0 +/- 0.1 eV and N0beta(app) = +0.8 +/- 0.2 eV. These non-standard values and signs of the s - d and p - d exchange energies are explained in terms of recent theories that suggest a contribution of the electron-hole exchange to the spin splitting of the conduction band and a renormalization of the free hole spin-splitting by a large p - d hybridization. According to these models, in the limit of a strong p - d coupling, the band gap of (Ga,Mn)N increases with x and the order of hole spin subbands is reversed, as observed. |
| Databáze: | OpenAIRE |
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