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HL: Halbleiterphysik

HL 9: Poster I

HL 9.30: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Optical and vibrational properties of p-doped Zn_1−xMn_xTe-bulk material — •C. Kehl¹, M. Eyring¹, M. Lentze¹, T. Kießling¹, Le Van Khoi², J. Geurts¹, and W. Ossau¹ — ¹Universität Würzburg, Physikalisches Institut, Experimentelle Physik III, Am Hubland, 97074 Würzburg — ²Institut of Physics, Polish Academy of Science, AL. Lotnikow 32/46, 02-668 Warsaw

Using magneto-optic photoluminescence, reflectivity and Raman measurements, p-doped Zn_1−xMn_xTe-bulk material was investigated in order to study its optical properties at the fundamental band gap and its lattice dynamics. The samples used for this study were grown via Bridgman technique with a Mn concentration from 0 up to 30% and doping levels from p = 1·10¹⁶ to 5·10¹⁹ cm⁻³.
The photoluminescence and reflectivity respectively was measured both without magnetic field and with B-fields up to 4 Tesla in Faraday configuration. It was applied for the exact determination of the Mn concentration in several samples, as well as for the investigation of the internal electronic Mn transition, the donor-acceptor-transition and the excitonic excitations. Furthermore the phonon behaviour was investigated via resonant Raman experiments, close to the fundamental gap resonance. The experiments were performed both without B-field and with B-field in Voigt configuration. An obvious dependence of the phonon eigenfrequencies on the Mn concentration of the sample could be demonstrated.