Spin-polarized surface resonances accompanying topological surface state formation

ORAL

Abstract

Strong spin-orbit coupling can drive a band inversion that makes a material topologically non-trivial. Using spin, time, and angle-resolved photoemission spectroscopy, we study the unoccupied bandstructure in a topological insulator and find a spin-polarized surface resonance near the topological surface state. This new state is a remnant of Rashba bands on the trivial side of the topological phase transition. From this, we learn how the into the topological surface state emerges upon band inversion.

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Authors

  • Kenneth Gotlieb

    • Graduate Group in Applied Science and Technology, University of California, Berkeley

  • Chris Jozwiak

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Jonathan Sobota

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

  • Alexander Kemper

    • Department of Physics, North Carolina State University, Raleigh, North Carolina

  • Costel Rotundu

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

  • Robert Birgenau

    • Department of Physics, University of California, Berkeley

  • Zahid Hussain

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Dung-Hai Lee

    • Department of Physics, University of California, Berkeley

  • Zhi-Xun Shen

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

  • Alessandra Lanzara

    • Department of Physics, University of California, Berkeley