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Energy landscape and band-structure tuning in realistic MoS_2/MoSe_2 heterostructures

机译:现实的MoS_2 / MoSe_2异质结构中的能级和能带调谐

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摘要

While monolayer forms of two-dimensional materials are well characterized both experimentally and theoretically, properties of bilayer heterostructures are not nearly so well known. We employ high-accuracy linear-scaling density functional theory calculations utilizing nonlocal van der Waals functionals to explore the possible constructions of the MoS_2/MoSe_2 interface. Utilizing large supercells, we vary rotation, translation, and separation of the layers without introducing unrealistic strain. The energy landscape shows very low variations under rotation, with no strongly preferred alignments. By unfolding the spectral function into the primitive cells, we show that the monolayers are more independent than in homo-bilayers and that the electronic band structure of each layer is tunable through rotation, thus influencing hole effective masses.
机译:虽然二维材料的单层形式在实验和理论上都得到了很好的表征,但双层异质结构的性质却不是那么众所周知。我们利用非局部范德华函数进行高精度线性比例密度泛函理论计算,以探索MoS_2 / MoSe_2界面的可能构造。利用大型超级电池,我们可以改变层的旋转,平移和分隔,而不会引入不切实际的应变。能量分布在旋转下显示出非常低的变化,没有强烈的对齐方式。通过将光谱函数展开到原始单元中,我们显示出单层比均双层中更独立,并且每层的电子能带结构可通过旋转进行调谐,从而影响空穴有效质量。

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