Quantum materials interfaces: Graphene/bismuth (111) heterostructures
Quantum materials interfaces: Graphene/bismuth (111) heterostructures
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DOI：
10.1103/physrevresearch.2.023157
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
I. Naumov;P. Dev
中科院分区：
文献类型：
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作者：
I. Naumov;P. Dev
涉及石墨烯和铋的异质结构具有在非常宽的能量范围内吸收光的能力，对设计下一代光电子学是有兴趣的。对于这种异质结构的技术应用来说，关键是理解支配其性质的基本物理。在这里，我们利用第一性原理计算，研究了石墨烯和铋薄膜之间的界面相互作用。我们的研究揭示了与这些超晶格的云纹物理相关的非直观现象。我们展示了石墨烯衍生的狄拉克锥体的保存，尽管靠近具有大的自旋-轨道耦合的衬底，石墨烯对铋的电子结构性质的更大影响，以及令人惊讶的磁性溶液的存在，仅在能量上略高于非磁性结构(几meV)，这可能验证了实验。这种与云纹物理相关的微妙和意想不到的现象有望在二维量子系统的非均相组装的实际应用中发挥关键作用。
Heterostructures involving graphene and bismuth, with their ability to absorb light over a very wide energy range, are of interest for engineering next-generation opto-electronics. Critical to the technological application of such heterostructures is an understanding of the underlying physics governing their properties. Here, using first-principles calculations, we study the interfacial interactions between graphene and bismuth thin-films. Our study reveals non-intuitive phenomena associated with the moire-physics of these superlattices. We show a preservation of graphene-derived Dirac cones in spite of proximity to a substrate with large spin-orbit coupling, a greater influence of graphene on the electronic structure properties of bismuth, and the surprising presence of a magnetic solution, only slightly higher in energy (by several meV) than the non-magnetic structure, possibly validating experiments. Such subtle and unanticipated phenomena associated with the moire-physics are expected to play key roles in the practical applications of heterogeneous assemblies of two-dimensional quantum systems.