Theory of quasiparticle interference on the surface of a strong topological insulator

Details Theory of quasiparticle interference on the surface of a strong topological insulator Theory of quasiparticle interference on the surface of a strong topological insulator

2009-10-26

arxiv.org/abs/0910.4946v2

Phys. Rev. B 81, 041102(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, 1 table. Version to appear in PRB/RC; Typos corrected

Scientific paper

Electrons on the surface of a strong topological insulator, such as Bi2Te3 or Bi1-xSnx, form a topologically protected helical liquid whose excitation spectrum contains an odd number of massless Dirac fermions. A theoretical survey and classification is given of the universal features, observable by the ordinary and spin-polarized scanning tunneling spectroscopy, in the interference patterns resulting from the quasiparticle scattering by magnetic and non-magnetic impurities in such a helical liquid. Our results confirm the absence of backscattering from non-magnetic impurities observed in recent experiments and predict new interference features, uniquely characteristic of the helical liquid, when the scatterers are magnetic.

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