title: Direct observation of broken time-reversal symmetry on the surface of a magnetically doped topological insulator.
abstract: We study interference patterns of a magnetically doped topological insulator Bi(2-x)Fe(x)Te(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.
authors.affiliation: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Okada
authors.forename: Chetan
authors.initials: C
authors.lastname: Dhital
authors.forename: Wenwen
authors.initials: W
authors.lastname: Zhou
authors.forename: Erik D
authors.initials: ED
authors.lastname: Huemiller
authors.forename: Hsin
authors.initials: H
authors.lastname: Lin
authors.forename: S
authors.initials: S
authors.lastname: Basak
authors.forename: A
authors.initials: A
authors.lastname: Bansil
authors.forename: Y-B
authors.initials: YB
authors.lastname: Huang
authors.forename: H
authors.initials: H
authors.lastname: Ding
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Wilson
authors.forename: V
authors.initials: V
authors.lastname: Madhavan