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

doi:10.1103/PhysRevLett.106.206805

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 journal › Article › peer-review

Abstract

We study interference patterns of a magnetically doped topological insulator Bi_2-xFe_xTe_3+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 language	English (US)
Article number	206805
Journal	Physical review letters
Volume	106
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.106.206805
State	Published - May 17 2011
Externally published	Yes

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General Physics and Astronomy

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10.1103/PhysRevLett.106.206805

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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.",

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AU - Okada, Yoshinori

AU - Dhital, Chetan

AU - Zhou, Wenwen

AU - Huemiller, Erik D.

AU - Lin, Hsin

AU - Basak, S.

AU - Bansil, A.

AU - Huang, Y. B.

AU - Ding, H.

AU - Wang, Z.

AU - Wilson, Stephen D.

AU - Madhavan, V.

PY - 2011/5/17

Y1 - 2011/5/17

N2 - 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.

AB - 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.

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Direct observation of broken time-reversal symmetry on the surface of a magnetically doped topological insulator

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