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Effective mass of two-dimensional electron gas in an Al0.2Ga0.8N/GaN heterojunction

Authors :
Chih-Hsiung Huang
Yuan Huei Chang
Hongxing Jiang
Yang-Fang Chen
Chi-Te Liang
D. R. Hang
Jingyu Lin
Source :
Applied Physics Letters. 79:66-68
Publication Year :
2001
Publisher :
AIP Publishing, 2001.

Abstract

We have performed a magnetotransport study on an AlGaN/GaN heterostructure at low temperatures. The effective-mass values have been evaluated by analyzing the exact form of the temperature-dependent Shubnikov–de Haas oscillation function. The values obtained increase with the magnetic field. This mass enhancement is attributed to conduction-band nonparabolicity. The effective-mass variation with the magnetic field was extrapolated to zero field, together with further correction due to the triangular confinement of the carriers, yielding an effective mass of 0.185±0.005 of the free-electron mass. Our result is in excellent agreement with the results obtained by first-principle calculations and the tight-binding method, and suggest the significance of magnetic-field-induced nonparabolicity in transport measurements.

Details

ISSN :
10773118 and 00036951
Volume :
79
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........eedc4a269d8b977a21dd4cbe7aa02f40
Full Text :
https://doi.org/10.1063/1.1380245