2011/07/29 by Zhanybek Alpichshev, Rudro R. Biswas, Alexander V. Balatsky +7 · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Quantum many-body systems #Topological Materials and Phenomena #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.108.206402
published as Phys. Rev. Lett. 108, 206402 (2012) · 5 pages, 6 figures
arxiv created 2011/07/29 · openalex publication_date 2012/05/15 · arxiv updated 2014/02/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In this Letter we present detailed study of the density of states near defects in Bi2Se3. In particular, we present data on the commonly found triangular defects in this system. While we do not find any measurable quasiparticle scattering interference effects, we do find localized resonances, which can be well fitted by theory [R. R. Biswas and A. V. Balatsky, Phys. Rev. B 81, 233405(R) (2010)] once the potential is taken to be extended to properly account for the observed defects. The data together with the fits confirm that while the local density of states around the Dirac point of the electronic spectrum at the surface is significantly disrupted near the impurity by the creation of low-energy resonance state, the Dirac point is not locally destroyed. We discuss our results in terms of the expected protected surface state of topological insulators.