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Si调制掺杂AlGaN/GaN异质结磁阻拍频现象
Beating patterns in the oscillatory magnetoresistance of a Si modulation-doped AlGaN/GaN heterostructure
【摘要】 在低温 (1 5K— 2 5K)和强磁场 (0— 10T)条件下 ,对二维电子气占据两个子带的Si调制掺杂AlGaN GaN异质结构进行磁输运测量 .在一定温度范围内观察到磁阻拍频现象 .根据Sander等人和Raikh等人给出的磁阻振荡的具体表达式 ,拟合实验结果表明磁阻拍频是由第一子带SdH振荡和磁致子带间散射引起的磁阻振荡导致的 .
【Abstract】 Magneto-transport measurements have been carried out on a Si modulation-doped Al 0.22 Ga 0.78 N/GaN heterostructure in a temperature range between 1.5 and 25 K under magnetic field up to 10T. Striking beating patterns in magnetoresistance vs magnetic field are observed in the vicinity of a specific temperature. Theoretical simulation is performed and the comparison between numerical simulations and the experimental data reveals that the beating patterns are due to the interference of the magneto-intersubband scattering and the SdH oscillator of first subband.
【Key words】 AlGaN/GaN heterostructure; SdH oscillator; magneto-intersubband scattering; beating patterns;
- 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2005年05期
- 【分类号】O474
- 【被引频次】2
- 【下载频次】110