Observation of topological crystalline insulator surface states on (111)-oriented Pb1xSnxSe films

C. M. Polley, P. Dziawa, A. Reszka, A. Szczerbakow, R. Minikayev, J. Z. Domagala, S. Safaei, P. Kacman, R. Buczko, J. Adell, M. H. Berntsen, B. M. Wojek, O. Tjernberg, B. J. Kowalski, T. Story, and T. Balasubramanian
Phys. Rev. B 89, 075317 – Published 28 February 2014

Abstract

We present angle-resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb1xSnxSe, a three-dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at Γ¯ and M¯ in the surface Brillouin zone, supporting recent theoretical predictions for this family of materials. We study the parallel dispersion isotropy and Dirac-point binding energy of the surface states, and perform tight-binding calculations to support our findings. The relative simplicity of the growth technique is encouraging, and suggests a clear path for future investigations into the role of strain, vicinality, and alternative surface orientations in (Pb,Sn)Se solid solutions.

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  • Received 12 December 2013
  • Revised 11 February 2014

DOI:https://doi.org/10.1103/PhysRevB.89.075317

©2014 American Physical Society

Authors & Affiliations

C. M. Polley1,*, P. Dziawa2, A. Reszka2, A. Szczerbakow2, R. Minikayev2, J. Z. Domagala2, S. Safaei2, P. Kacman2, R. Buczko2, J. Adell1, M. H. Berntsen3,†, B. M. Wojek3, O. Tjernberg3, B. J. Kowalski2, T. Story2, and T. Balasubramanian1

  • 1MAX IV Laboratory, Lund University, 221 00 Lund, Sweden
  • 2Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland
  • 3KTH Royal Institute of Technology, ICT Materials Physics, Electrum 229, 164 40 Kista, Sweden

  • *craig.polley@maxlab.lu.se
  • Present address: Deutsches Elektronen-Synchrotron (DESY), Photon Science, Coherent X-ray Scattering, Notkestrasse 85, 22607 Hamburg, Germany.

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Vol. 89, Iss. 7 — 15 February 2014

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