Moiré superlattices at the topological insulator Bi2Te3.
Moiré superlattices at the topological insulator Bi2Te3.
复制标题
拓扑绝缘体 Bi2Te3 处的莫尔超晶格
DOI：
10.1038/srep20278
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发表时间：
2016-02-08
影响因子：
4.6
通讯作者：
Park K
中科院分区：
文献类型：
--
作者：
Schouteden K;Li Z;Chen T;Song F;Partoens B;Van Haesendonck C;Park K
我们报道了在拓扑绝缘体Bi2Te3表面观察到的复杂超晶格。扫描隧道显微镜发现，除了Bi2Te3原子晶格外，还存在两种不同的周期结构，这两种结构对局部电子结构有强烈的影响。这三种不同的周期性被解释为仅由最顶层五元层的单个小平面内旋转引起的。密度泛函理论计算支持观测到的DOS在费米能级附近的增加，并排除了应变是观测到的莫尔维尔模式起源的可能性。探索由五层拓扑绝缘体形成的莫尔维尔超晶格，为进一步调整拓扑绝缘体的性质提供了巨大的潜力。
We report on the observation of complex superlattices at the surface of the topological insulator Bi2Te3. Scanning tunneling microscopy reveals the existence of two different periodic structures in addition to the Bi2Te3 atomic lattice, which is found to strongly affect the local electronic structure. These three different periodicities are interpreted to result from a single small in-plane rotation of the topmost quintuple layer only. Density functional theory calculations support the observed increase in the DOS near the Fermi level, and exclude the possibility that strain is at the origin of the observed Moiré pattern. Exploration of Moiré superlattices formed by the quintuple layers of topological insulators holds great potential for further tuning of the properties of topological insulators.