Direct Observation of Broken Time-Reversal Symmetry on the Surface of a Magnetically Doped Topological Insulator

Yoshinori Okada, Chetan Dhital, Wenwen Zhou, Erik D. Huemiller, Hsin Lin, S. Basak, A. Bansil, Y.-B. Huang, H. Ding, Z. Wang, Stephen D. Wilson, and V. Madhavan
Phys. Rev. Lett. 106, 206805 – Published 17 May 2011
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Abstract

We study interference patterns of a magnetically doped topological insulator Bi2xFexTe3+d by using Fourier transform scanning tunneling spectroscopy and observe several new scattering channels. A comparison with angle-resolved photoemission spectroscopy allows us to unambiguously ascertain the momentum-space origin of distinct dispersing channels along high-symmetry directions and identify those originating from time-reversal symmetry breaking. Our analysis also reveals that the surface state survives far above the energy where angle-resolved photoemission spectroscopy finds the onset of continuum bulk bands.

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  • Received 20 January 2011

DOI:https://doi.org/10.1103/PhysRevLett.106.206805

© 2011 American Physical Society

Authors & Affiliations

Yoshinori Okada1, Chetan Dhital1, Wenwen Zhou1, Erik D. Huemiller1, Hsin Lin2, S. Basak2, A. Bansil2, Y.-B. Huang3, H. Ding3, Z. Wang1, Stephen D. Wilson1, and V. Madhavan1

  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
  • 2Physics Department, Northeastern University, Boston, Massachusetts 02115, USA
  • 3Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

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Vol. 106, Iss. 20 — 20 May 2011

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