Thermally activated intersubband scattering and oscillating magnetoresistance in quantum wells
Thermally activated intersubband scattering and oscillating magnetoresistance in quantum wells
复制标题
量子阱中的热激活子带间散射和振荡磁阻
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Portal
中科院分区：
文献类型：
--
作者：
S. Wiedmann;G. Gusev;O. Raichev;A. Bakarov;J. Portal
高迁移率宽量子阱的磁电阻实验研究表明，当温度升高到10 K时出现振荡，其周期与舒布尼科夫-德哈斯振荡周期接近。所观察到的现象被确定为磁子带间振荡，这是由电子在两个已占据的子带和由于热激活而被占据的第三个子带之间的散射引起的。这些小周期振荡对热抑制的敏感性低于由第一和第二子带之间的散射引起的大周期磁子带间振荡。理论研究在考虑第三子带边缘附近电子散射的基础上，对我们的实验结果给出了合理的解释。
Experimental studies of magnetoresistance in high-mobility wide quantum wells reveal oscillations which appear with an increase in temperature to 10 K and whose period is close to that of Shubnikov-de Haas oscillations. The observed phenomenon is identified as magnetointersubband oscillations caused by the scattering of electrons between two occupied subbands and the third subband which becomes occupied as a result of thermal activation. These small-period oscillations are less sensitive to thermal suppression than the largeperiod magnetointersubband oscillations caused by the scattering between the first and the second subbands. Theoretical study, based on consideration of electron scattering near the edge of the third subband, gives a reasonable explanation of our experimental findings.