SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Poster Session I: Topological insulators
O 10.1: Poster
Montag, 1. März 2021, 10:30–12:30, P
Topologization of beta-antimonene on Bi2Se3 via proximity effects — •Kris Holtgrewe1, Conor Hogan2, and Simone Sanna1 — 1Justus-Liebig-Universität, Gießen, Germany — 2Institute of Structure of Matter (ISM-CNR), Rome, Italy
Thin antimony (Sb) layers adsorbed on bismuth selenide (Bi2Se3) are an exciting van der Waals heterostructure system. While the substrate is a topological insulator (TI), thin sheets of the β-phase of antimony are topologically trivial (CI). So, the question arises whether the topological surface states form at the substrate-adlayer interface or whether the TI/CI boundary shifts downwards (trivialization of the substrate) or upwards (topologization of the adlayer). In this theoretical work, we apply density functional theory to model heterostructures of single and double bilayers of antimonene on a bismuth selenide substrate. After investigating the structural details, we analyse the space- and spin-resolved electronic band structure. We show that the topological surface states of the pristine Bi2Se3 substrate migrate to the top antimony bilayer, while their unique helical spin texture is preserved. The topologization of the Sb sheets is a consequence of the complex hybridization process between the bands of the substrate and the sheets.