Exchange-enhanced g-factors in an Al0.25Ga0.75N/GaN two-dimensional electron system

Cho, K. S.; Huang, Tsai-Yu; Huang, Chao-Ping; Chiu, Yi-Hsing; Liang, C.-T.; Chen, Y. F.; Lo, Ikai
December 2004
Journal of Applied Physics;12/15/2004, Vol. 96 Issue 12, p7370
Academic Journal
Low-temperature magnetotransport measurements were performed on an Al0.25Ga0.75N/GaN two-dimensional electron system. In this system, we observe Shubnikov-de Haas (SdH) oscillations in a perpendicular magnetic field B. By measuring the positions of a pair of spin-split SdH maxima, we are able to estimate the g-factors at different Landau level (LL) indices. We find the g-factor is enhanced over its bulk value in GaN (≅2) due to many-body exchange interactions. Moreover, the measured g-factor increases with decreasing LL index, indicating that many-body electron–electron interactions become stronger as the number of occupied LLs decreases. Our results suggest that the exchange energy Eex shows an approximately linear B dependence.


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