Cyclotron emission study of electron masses in GaAs-GaAlAs heterostructures
Cyclotron emission study of electron masses in GaAs-GaAlAs heterostructures
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GaAs-GaAlAs 异质结构中电子质量的回旋发射研究
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
A. Raymond
中科院分区：
文献类型：
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作者：
W. Zawadzki;C. Chaubet;D. Dur;W. Knap;A. Raymond
我们研究了 GaAs-GaAlAs 异质结构的远红外回旋加速器发射，这种发射是在磁场和静水压力存在的情况下由电脉冲引起的。在压力 P=0 和 P=7 kbar 的强电子加热状态下，回旋加速器质量被测量为二维电子密度的函数。结果由有效的两级 k.p 理论描述，该理论始终考虑能带非抛物线性对电和磁量子化的影响。结果表明，由于二维电子气是非简并的，因此观察到的发射光谱是由于朗道能级之间的多次跃迁所致。同样的理论也被用来描述其他作者的回旋加速器吸收数据，这些数据是在简并电子气条件下在零和非零压力下获得的。结果表明，回旋加速器吸收可以在两种不同的状态下测量，这解释了数据对光子能量的强烈依赖性。通过使用块状 GaAs 参数，可以对各种发射和吸收实验进行非常好的理论描述。
We study far-infrared cyclotron emission from GaAs-GaAlAs heterostructures, induced by electric pulses in the presence of a magnetic field and hydrostatic pressure. Cyclotron masses are measured as functions of 2D electron density in the strong electron heating regime at the pressures of P=0 and P=7 kbar. The results are described by an effective two-level k.p theory, which takes consistently into account the effect of band non-parabolicity on electric and magnetic quantization. It is shown that the observed emission spectrum is due to several transitions between Landau levels, since the 2D electron gas is non-degenerate. The same theory is used to describe cyclotron absorption data of other authors, obtained at zero and non-zero pressures under the conditions of degenerate electron gas. It is shown that the cyclotron absorption can be measured in two different regimes, which explains a strong dependence of the data on photon energy. A very good theoretical description of various emission and absorption experiments is achieved with the use of bulk GaAs parameters.