TITLE

Nonparabolicity of the conduction band of wurtzite GaN

AUTHOR(S)
Syed, S.; Heroux, J. B.; Wang, Y. J.; Manfra, M. J.; Molnar, R. J.; Stormer, H. L.
PUB. DATE
December 2003
SOURCE
Applied Physics Letters;12/1/2003, Vol. 83 Issue 22, p4553
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using cyclotron resonance, we measure the effective mass, m[sup *], of electrons in AlGaN/GaN heterostructures with densities, n[sub 2D]∼1 to 6×10[sup 12] cm[sup -2]. From our extensive data, we extrapolate a band edge mass of (0.208±0.002)m[sub e]. By comparing our m[sup *] data with the results of a multiband k·p calculation, we infer that the effect of remote bands is essential in explaining the observed conduction-band nonparabolicity (NP). Our calculation of polaron mass corrections—including finite width and two-dimensional (2D) screening—suggests those to be negligible. It implies that the behavior of m[sup *](n[sub 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. © 2003 American Institute of Physics.
ACCESSION #
11503314

 

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