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Spin-polarized surface resonances accompanying topological surface state formation

Author

Listed:
  • Chris Jozwiak

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • Jonathan A. Sobota

    (Advanced Light Source, Lawrence Berkeley National Laboratory
    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    Geballe Laboratory for Advanced Materials, Stanford University)

  • Kenneth Gotlieb

    (Graduate Group in Applied Science and Technology, University of California)

  • Alexander F. Kemper

    (North Carolina State University
    Lawrence Berkeley National Laboratory)

  • Costel R. Rotundu

    (Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory)

  • Robert J. Birgeneau

    (Lawrence Berkeley National Laboratory
    University of California
    University of California)

  • Zahid Hussain

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • Dung-Hai Lee

    (Lawrence Berkeley National Laboratory
    University of California)

  • Zhi-Xun Shen

    (Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    Geballe Laboratory for Advanced Materials, Stanford University)

  • Alessandra Lanzara

    (Lawrence Berkeley National Laboratory
    University of California)

Abstract

Topological insulators host spin-polarized surface states born out of the energetic inversion of bulk bands driven by the spin-orbit interaction. Here we discover previously unidentified consequences of band-inversion on the surface electronic structure of the topological insulator Bi2Se3. By performing simultaneous spin, time, and angle-resolved photoemission spectroscopy, we map the spin-polarized unoccupied electronic structure and identify a surface resonance which is distinct from the topological surface state, yet shares a similar spin-orbital texture with opposite orientation. Its momentum dependence and spin texture imply an intimate connection with the topological surface state. Calculations show these two distinct states can emerge from trivial Rashba-like states that change topology through the spin-orbit-induced band inversion. This work thus provides a compelling view of the coevolution of surface states through a topological phase transition, enabled by the unique capability of directly measuring the spin-polarized unoccupied band structure.

Suggested Citation

  • Chris Jozwiak & Jonathan A. Sobota & Kenneth Gotlieb & Alexander F. Kemper & Costel R. Rotundu & Robert J. Birgeneau & Zahid Hussain & Dung-Hai Lee & Zhi-Xun Shen & Alessandra Lanzara, 2016. "Spin-polarized surface resonances accompanying topological surface state formation," Nature Communications, Nature, vol. 7(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13143
    DOI: 10.1038/ncomms13143
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