Photoluminescene under magnetic field and hydrostatic pressure for probing the electronic properties of GaAsN

The puzzling electronic properties of GaAsN have been investigated through the compositional dependence of two highly sensitive band structure parameters: the electron effective mass, m,, and the electron gyromagnetic factor, g(e). In the N concentration range from 0% to 0.7%, both m(e) and g(e) show a highly nonlinear dependence on N composition that can be explained in terms of alternating on- and off-resonance conditions between the red-shifting conduction band edge and specific energy-pinned N cluster states. Furthermore, the electronic properties of the material are studied under hydrostatic pressure, P. This allows tuning in a same sample the interaction between extended and localized states and disclosing a hierarchy between different nitrogen complexes as regards the extent of the perturbation these complexes exert on the electronic properties of the GaAs host crystal. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.