Abstract Transition metal dichalcogenides generally have three atomic layers forming a buckled honeycomb structure as a covalent sheet. The van der Waals force is the key interaction between these sheets. In our work, we have fabricated a single layered copper selenide structure by employing molecular beam epitaxy method. The selenium and copper atoms form a Moire pattern with respect to the substrate Cu(111). Combined with density functional theory calculation, the narrow band gap of these structures is investigated in detail.

中文翻译：

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Cu(111)上单层硒化铜纳米图案蜂窝结构

摘要 过渡金属二硫属化物通常具有三个原子层，形成作为共价片的屈曲蜂窝结构。范德华力是这些片材之间的关键相互作用。在我们的工作中，我们采用分子束外延方法制造了单层硒化铜结构。硒和铜原子相对于衬底 Cu(111) 形成莫尔图案。结合密度泛函理论计算，详细研究了这些结构的窄带隙。