Comparison of the electron effective mass of the n-type ZnO in the wurtzite structure measured by cyclotron resonance and calculated from first principle theory

The electron effective mass of n-type ZnO obtained recently by the cyclotron resonance is compared with the quasiparticle mass predicted by the GW approximation which takes into account the dynamical screening effects within the random phase approximation. The bare electron effective mass has been determined to be about 0.23 m(0) (B \ \c-axis) by cyclotron resonance experiments excluding electron-phonon coupling. On the other hand, the calculated quasiparticle mass has been obtained as about 0.24m(0). We have found that the dynamical screening effect enhances the mass obtained by the conventional local density approximation by about 17% and the predicted quasiparticle mass is in good agreement with the experiment. (C) 2001 Elsevier Science B.V. All rights reserved.