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26 April 2024 |
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Observation of novel interference patterns in Bi2-xFexTe3+d by Fourier transform scanning tunneling spectroscopy | | Y. Okada
; C. Dhital
; Wen-Wen Zhou
; Hsin Lin
; S. Basak
; A. Bansil
; Y. -B. Huang
; H. Ding
; Z. Wang
; Stephen D. Wilson
; V. Madhavan
; | | Date: |
22 Nov 2010 | | Abstract: | In topological insulators (TI), strong spin-orbit coupling results in
non-trivial scattering processes of the surface states, whose effects include
suppressed back scattering1, 2, 3, 4 weak anti-localization5, 6 and the
possibility of an exotic Kondo effect that mimics graphene7. Introducing time
reversal breaking perturbations and establishing long-range magnetic order has
been theorized to lead to the formation of quantized magnetoelectric
phenomena8, fractionalized charge excitations, and the appearance of quantum
wire states9. A key, elusive, step in exploring these and other novel
electronic phases is the experimental observation of charge backscattering due
to spin-flip processes at the surface of a magnetically-doped TI. Here we
utilize Fourier transform scanning tunneling spectroscopy (FT-STS) to probe the
surface of a magnetically doped TI, Bi2-xFexTe3+d. Our measurements show the
appearance of a hitherto unobserved channel of electronic backscattering along
surface q-vector Gammakappa. By combining FT-STS with angle-resolved
photoemission data, we identify the momentum space origins of the observed
q-vectors, which on comparison to a model calculation are enhanced by spin-flip
scattering. Our findings present compelling evidence for the first spatial and
momentum resolved measurements of magnetic impurity induced backscattering in a
prototypical TI. | | Source: | arXiv, 1011.4913 | | Services: | Forum | Review | PDF | Favorites | |
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