Conduction-band electron effective mass in Zn_0.87Mn_0.13Se measured by terahertz and far-infrared magnetooptic ellipsometry

Authors

Tino Hofmann, Institut für Experimentelle Physik II, Fakultät für Physik und Geowissenschaften, Universität Leipzig, 04103 Leipzig, GermanyFollow
U. Schade, BESSY GmbH, 12489 Berlin, Germany
K.C. Agarwal, Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76131 Karlsruhe, Germany
B. Daniel, Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76131 Karlsruhe, Germany
C. Klingshirn, Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76131 Karlsruhe, Germany
M. Hetterich, Institut für Angewandte Physik and Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), 76131 Karlsruhe, Germany
C.M. Herzinger, J.A. Woollam Company, Incorporated, Lincoln, Nebraska
Mathias Schubert, University of Nebraska - LincolnFollow

Date of this Version

1-1-2006

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 88, 042105 2006. © 2006 American Institute of Physics. Permission to use. http://apl.aip.org/.

Abstract

We determine the electron effective mass parameter m^*=0.086±0.004 m₀ of thin-film n-type low-chlorine-doped Zn_0.87Mn_0.13Se with free-charge-carrier concentration N=4.5x10¹⁷ cm^-3 and optical mobility ) =300±20 cm² / (V s) using magneto-optic generalized ellipsometry in the terahertz and far-infrared spectral domain for wave numbers from ω =30–650 cm^-1. The room-temperature measurements were carried out with magnetic fields up to 3 T. We employ synchrotron and black-body radiation sources for the terahertz and far-infrared spectral regions, respectively. Comparison with previous experimental results from samples with considerably higher free electron density and theoretical calculations suggest that our value is sufficiently unaffected by band nonparabolicity and provides a good approximation of the Γ -point conduction band mass in Zn_0.87Mn_0.13Se. We further provide optical phonon mode parameters and the high-frequency dielectric constant.