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, V. Madhavan

Research output: Contribution to journalArticlepeer-review

Abstract

We study interference patterns of a magnetically doped topological insulator Bi2-xFexTe3+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.

Original languageEnglish (US)
Article number206805
JournalPhysical review letters
Volume106
Issue number20
DOIs
StatePublished - May 17 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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