Abstract
Abstract This paper reports magnetotransport property of a graded AlGaN/GaN heterostructure. When temperature (T) is higher than 10 K, resistivity as a function of T exhibits a metallic conduction behavior, from which the Debye temperature of 1074.4 K is extracted. At low Ts, clear Shubnikov-de-Haas (SdH) oscillations in magnetoresistance (MR) curve are observed when magnetic field is larger than 2 T. The observed SdH oscillations originate from the two-dimensional electrons. From fast Fourier transform power spectrums of the SdH oscillations, it is found that there are five occupied subbands, in agreement with the results obtained from the energy band calculation. In the intermediate field range of MR curve, a parabolic negative MR is observed, which can be attributed to the two-dimensional electron-electron interaction effect.
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