We fabricated superlattice films composed of Bi2 bilayers (BLs) and Bi2Te3 quintuple layers (QLs) by annealing pure Bi2Te3 films. It was found that Te desorbs from the QL to form the BL with an activation energy of 2.7 eV. Eventually, two distinct stoichiometric phases were formed, Bi1Te1 (QL–BL–QL) and Bi4Te3 (QL–BL), as evidenced by scanning transmission emission microscopy measurements. The surface-state dispersion was measured with angle-resolved photoemission spectroscopy, and the topological nature of each sample is discussed. Our method offers a convenient and simple way to fabricate superlattice films with different topological properties.

中文翻译：

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通过从原始 Bi2Te3 薄膜解吸 Te 制备 (Bi2)m(Bi2Te3)n 超晶格薄膜

我们制造了由 Bi 组成的超晶格薄膜2个双层 (BLs) 和 Bi2个特3个通过退火纯 Bi 获得五层 (QL)2个特3个电影。发现 Te 从 QL 解吸形成 BL，活化能为 2.7 eV。最终，形成了两个不同的化学计量相，Bi1个特1个(QL–BL–QL) 和 Bi4个特3个（QL-BL），如扫描透射发射显微镜测量所证明的那样。用角分辨光电子能谱测量表面态色散，并讨论了每个样品的拓扑性质。我们的方法提供了一种方便简单的方法来制造具有不同拓扑特性的超晶格薄膜。