Magneto-optical investigations on cubic GaN in high magnetic fields

We report on direct IR-cyclotron resonance (CR) spectra of p-type cubic GaN (c-GaN) using semidestructive single-turn coil megagauss field generation. Two strong temperature dependent CR transitions were detected using measur ement techniques with optimized signal to noise ratio resolving transmissio n changes smaller then 2%. On the basis of group theoretical relations betw een the valence-band energy-parameters of the effective Rashba-Sheka-Pikus Hamiltonian for the wurtzite and the effective Kohn-Luttinger Hamiltonian f or the zincblende structure the Landau level scheme was calculated for c-Ga N and compared with the observed transitions. (C) 1998 Published by Elsevie r Science B.V. All rights reserved.