Impact of Ultrathin Pb Films on the Topological Surface and Quantum-Well States of [Bi.sub.2][Se.sub.3] and [Sb.sub.2][Te.sub.3] Topological Insulators

• Published in: Journal of experimental and theoretical physics Vol. 126; no. 4; pp. 535 - 1069
• Main Authors: Surnin, Yu.A, Klimovskikh, I.I, Sostina, D.M, Kokh, K.A, Tereshchenko, O.E, Shikin, A.M
• Format: Journal Article
• Language: English
• Published: Springer 01.04.2018
• Subjects: Energy (Physics); Quantum wells; Superconductors
• DOI: 10.1134/S1063776118040088
• ISSN: 1063-7761

The effect of an ultrathin Pb film deposited on the surface of [Bi.sub.2][Se.sub.3] and [Sb.sub.2][Te.sub.3] compounds on the electronic state structure of topological insulators is studied experimentally by the angle-resolved photoemission spectroscopy (ARPES) technique. The following features are revealed: formation of two-dimensional quantum-well states in the near-surface region, an increase in the binding energy of the Dirac cone and the core levels, and a simultaneous electronic states intensity redistribution in the system in photoemission spectra. The results obtained show that topological states may coexist at the interface between studied materials and a superconductor, which seems to be promising for application in quantum computers.