Two-subband-populated AIGaN/GaN heterostructures probed by electrically detected and microwave-modulated magnetotranspot measurements
Journal
Applied Physics Letters
Journal Volume
89
Journal Issue
9
Date Issued
2006
Author(s)
Abstract
The authors apply the microwave-modulated technique to study the transport properties of two-subband-populated AlGaN/GaN heterostructures. The microwave modulation enhances the small Shubnikov-de Haas oscillations at low magnetic fields, providing a direct way to compare the mobilities of different subbands from the experimental data. In addition, this technique can help us to determine the subband-energy separation, especially when the population of the second subband is much lower than that of the first one. Variation of subband-energy separation due to different spacer thicknesses is obtained. Therefore, the authors showed a powerful way to probe parameters of two-subband-populated AlGaN/GaN heterostructures. © 2006 American Institute of Physics.
SDGs
Type
journal article