arXiv · cond-mat/0309630
Non-parabolicity of the conduction band of wurtzite GaN
Abstract
Using cyclotron resonance, we measure the effective mass, $m$*, of electrons in AlGaN/GaN heterostructures with densities, $n_{2D}\sim 1-6\times10^{12}$cm$^{-2}$. From our extensive data, we extrapolate a band edge mass of $(0.208\pm0.002) m_e$. By comparing our $m$* data with the results of a multi-band \textbf{k.p} calculation we infer that the effect of remote bands is essential in explaining the observed conduction band non-parabolicity (NP). Our calculation of polaron mass corrections -- including finite width and screening - suggests those to be negligible. It implies that the behavior of $m*(n_{2D})$ can be understood solely in terms of NP. Finally, using our NP and polaron corrections, we are able to reduce the large scatter in the published band edge mass values.
Explore related subjects
Keep this discovery
S. Syed, J. B. Heroux, Y. J. Wang, M. J. Manfra, R. J. Molnar, H. L. Stormer. 2003-09-27. Non-parabolicity of the conduction band of wurtzite GaN. https://doi.org/10.1063/1.1630369
Cite the original work for its findings. Save a collection to share your selection of sources.