基于 ZnMgO/ZnO 异质结构模型，从压电极化对应变弛豫度的依赖关系出发，通过自洽求解一维泊松-薛定谔方程，研究了 ZnMgO 势垒层的厚度、Mg 组分和应变弛豫度对 ZnMgO/ZnO 异质界面处二维电子气(2DEG)的分布、面密度等性质的影响，并结合极化和能带偏移对计算结果进行了分析讨论。结果表明通过改变 Mg 组分和应变弛豫度可以调节异质界面两边的极化强度不连续性，进而有效地调控异质结中的二维电子气。
Based on the model of ZnMgO/ZnO heterostructure with relaxation-dependent piezoelectric polariza-tion,the distribution and the sheet concentration of two-dimensional electron gas (2DEG)in heterointerface for diffe-rent structural parameters were studied by solving the one-dimensional Poisson and Schr?dinger equations self-consis-tently.The influences of the thickness of ZnMgO barrier,the Mg content and the degree of strain relaxation were in-vestigated separately,and analyses for the corresponding results concerned with the polarization and the band offset were conducted.The computational results indicated that the polarization can be changed by altering the Mg content and the degree of strain relaxation,and thus the 2DEG can be controlled effectively.
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