Holtgrewe K, Mahatha S K, Sheverdyaeva P M, Moras P, Flammini R, Colonna S, Ronci F, Papagno M, Barla A, Petaccia L, Aliev Z S, Babanly M B, Chulkov E V, Sanna S, Hogan C, Carbone C
Institut für Theoretische Physik and Center for Materials Research (LaMa), Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392, Gießen, Germany.
Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy.
Sci Rep. 2020 Sep 3;10(1):14619. doi: 10.1038/s41598-020-71624-4.
Topological surface states usually emerge at the boundary between a topological and a conventional insulator. Their precise physical character and spatial localization depend on the complex interplay between the chemical, structural and electronic properties of the two insulators in contact. Using a lattice-matched heterointerface of single and double bilayers of β-antimonene and bismuth selenide, we perform a comprehensive experimental and theoretical study of the chiral surface states by means of microscopy and spectroscopic measurements complemented by first-principles calculations. We demonstrate that, although β-antimonene is a trivial insulator in its free-standing form, it inherits the unique symmetry-protected spin texture from the substrate via a proximity effect that induces outward migration of the topological state. This "topologization" of β-antimonene is found to be driven by the hybridization of the bands from either side of the interface.
拓扑表面态通常出现在拓扑绝缘体和传统绝缘体的边界处。它们精确的物理特性和空间局域性取决于相互接触的两种绝缘体的化学、结构和电子性质之间复杂的相互作用。利用β - 锑烯和硒化铋单双层的晶格匹配异质界面，我们通过显微镜和光谱测量，并辅以第一性原理计算，对手性表面态进行了全面的实验和理论研究。我们证明，尽管β - 锑烯在其独立存在形式下是一种平凡绝缘体，但它通过一种诱导拓扑态向外迁移的近邻效应，从衬底继承了独特的对称性保护自旋纹理。发现β - 锑烯的这种“拓扑化”是由界面两侧能带的杂化驱动的。
