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ISSN - 03682048, Journal of Electron Spectroscopy and Related Phenomena, 2013, vol. 195, p. 258-262

Electron dynamics of unoccupied states in topological insulators

Niesner D., Otto S., Fauster Th, Chulkov E. V., Eremeev S. V., Tereshchenko O. E., Kokh K. A.

© 2014 Elsevier B.V. All rights reserved. The topological insulators Bi2Se3 and Bi2Te2Se have been shown to possess unoccupied topological surface states at the center of the surface Brillouin zone at energies around 1.3 eV above the Fermi level. Using time-resolved two-photon photoemission we study the electron dynamics of the unoccupied topological surface states, image-potential states and conduction bands on these surfaces.