Sander, D.
Preparation and characterization of FeSe and Bi nanostructures on Bi2Se3(0001): A scanning tunneling microscopy study
3.1 Ultrathin films, 3.2 Clusters and nanoparticles on surfaces, Encyclopedia of interfacial chemistry: surface science and electrochemistry 3, pp 567-572 (Ed.) Wandelt, K.,Elsevier, , ISBN 978-0-12-814987-4 2018
Procedures for the preparation of Bi2Se3(0001) surfaces, FeSe atomic layers, and Bi bilayers on Bi2Se3(0001) are presented. Bi2Se3(0001) surfaces are characterized by terraces separated by quintuple layer high steps of 0.95 nm height. Epitaxial FeSe islands with lateral extensions of several hundred nanometers and a few unit cell (nm) thickness are produced by Fe deposition at room temperature and subsequent annealing at 650 K. These islands are under an anisotropic in-plane strain (a = 0.377 ± 0.002nm, b = 0.385 ± 0.004nm) with respect to the bulk FeSe reference state (aFeSe,bulk = nm). Bi bilayers are formed on Bi2Se3(0001) by atomic hydrogen plasma etching, which removes Se from the Bi2Se3 sample surface. Scanning tunneling microscopy and scanning tunneling spectroscopy are used to characterize the Bi2Se3 substrate and the nanostructures formed on its surface. A differential conductance peak near V identifies a defect-free Bi bilayer on Bi2Se3(0001).