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Magneto-Spectroscopy of Two-Electron Transitions in Homoepitaxial GaN.

Published online by Cambridge University Press:  21 March 2011

M. Wojdak ,
J.M. Baranowski ,
A. Wysmolck ,
K. Pakula ,
R. Stepnicwski ,
M. Potemski ,
I. Grzegory  and
S. Porowski
M. Wojdak
Affiliation:
Instiute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland
J.M. Baranowski
Affiliation:
Instiute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland
A. Wysmolck
Affiliation:
Instiute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland Grenoble High Magnetic Field Laboratory, MPI/FKF-CNRS, BP166X, F-38042 Grenoble Cedex 9, France
K. Pakula
Affiliation:
Instiute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland
R. Stepnicwski
Affiliation:
Instiute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland
M. Potemski
Affiliation:
Grenoble High Magnetic Field Laboratory, MPI/FKF-CNRS, BP166X, F-38042 Grenoble Cedex 9, France
I. Grzegory
Affiliation:
High Pressure Research Center Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, Poland
S. Porowski
Affiliation:
High Pressure Research Center Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, Poland
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Abstract

Two-electron transition occurs when the exciton bound to a neutral donor (DBE) recombines and leaves the donor in an excited state. The two-electron energy is therefore lower than that of the DBE peak by the difference in ground and excited state of the neutral donor. In a magnetic field the two-electron satellite splits into several components. These intra-donor excitations have been studied in homoepitaxial GaN up to magnetic fields reaching 23T. For Faraday (B‖c) configuration the two-electron transition splits mainly into 2s, 2p0, 2p+ and 2p- components. The total splitting between 2p+ and 2p- is equal to Landau energy. For Voigt (B???c) configuration in addition to transition to 2s, 2p0, 2p- and 2p+ there are additional lines which origin is discussed. It has been found that for two configurations of magnetic field the separation between 2p+ and 2p- is not exactly equal, what indicates the anisotropy of the electron effective mass. It has been found that m| = 0.205m0 and m??? = 0.225m0.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 693 , 2001 , I8.10.1
Copyright
Copyright © Materials Research Society 2002

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