Non-parabolicity of the conduction band of wurtzite GaN

Details Non-parabolicity of the conduction band of wurtzite GaN Non-parabolicity of the conduction band of wurtzite GaN

2003-09-27

arxiv.org/abs/cond-mat/0309630v1

Physics

Condensed Matter

Scientific paper

10.1063/1.1630369

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.

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