瑞利声表面波作用下二维Dirac材料的声电效应
Acoustoelectric effect in two-dimensional Dirac materials exposed to Rayleigh surface acoustic waves
摘要：
我们研究了二维材料中的声电效应，如位于非压电衬底上的过渡金属二硫属化物单分子膜，并暴露于瑞利表面声波。我们研究的行为的霍尔分量的电流密度出现由于三角形翘曲的谷在k-空间。我们计算了电流密度的谱，并研究了它与样品中电子有效寿命和密度的关系。我们区分的漂移和扩散的电流和显示组件，其中组件变成占主导地位。此外，我们比较的瑞利和Bluestein-Gulyaev声波，这出现如果样品位于压电基板上的效果。
英文摘要：
We study the acoustoelectric effect in two-dimensional materials like transition metal dichalcogenide monolayers located on a non-piezoelectric substrate and exposed to the Rayleigh surface acoustic waves. We investigate the behavior of the Hall component of the electric current density which appears due to the trigonal warping of the valleys in k-space. We calculate the spectrum of the current density and study its dependence on the electron effective lifetime and density in the sample. We distinguish between the drift and diffusive components of the current and show, which components turn out predominant. Furthermore, we compare the effect of the Rayleigh and Bluestein-Gulyaev acoustic waves, which appear if the sample is located on a piezoelectric substrate.
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