Disorder enabled band structure engineering of a topological insulator surface

Y. Xu, J. Chiu, L. Miao, H. He, Z. Alpichshev, A. Kapitulnik, R. Biswas, L. Wray, Nature Communications 8 (2017).

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Journal Article | Published | English
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Abstract
Three-dimensional topological insulators are bulk insulators with Z 2 topological electronic order that gives rise to conducting light-like surface states. These surface electrons are exceptionally resistant to localization by non-magnetic disorder, and have been adopted as the basis for a wide range of proposals to achieve new quasiparticle species and device functionality. Recent studies have yielded a surprise by showing that in spite of resisting localization, topological insulator surface electrons can be reshaped by defects into distinctive resonance states. Here we use numerical simulations and scanning tunnelling microscopy data to show that these resonance states have significance well beyond the localized regime usually associated with impurity bands. At native densities in the model Bi2X3 (X=Bi, Te) compounds, defect resonance states are predicted to generate a new quantum basis for an emergent electron gas that supports diffusive electrical transport.
Publishing Year
Date Published
2017-02-03
Journal Title
Nature Communications
Volume
8
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Xu Y, Chiu J, Miao L, et al. Disorder enabled band structure engineering of a topological insulator surface. Nature Communications. 2017;8. doi:10.1038/ncomms14081
Xu, Y., Chiu, J., Miao, L., He, H., Alpichshev, Z., Kapitulnik, A., … Wray, L. (2017). Disorder enabled band structure engineering of a topological insulator surface. Nature Communications, 8. https://doi.org/10.1038/ncomms14081
Xu, Yishuai, Janet Chiu, Lin Miao, Haowei He, Zhanybek Alpichshev, Aharon Kapitulnik, Rudro Biswas, and Lewis Wray. “Disorder Enabled Band Structure Engineering of a Topological Insulator Surface.” Nature Communications 8 (2017). https://doi.org/10.1038/ncomms14081.
Y. Xu et al., “Disorder enabled band structure engineering of a topological insulator surface,” Nature Communications, vol. 8, 2017.
Xu Y, Chiu J, Miao L, He H, Alpichshev Z, Kapitulnik A, Biswas R, Wray L. 2017. Disorder enabled band structure engineering of a topological insulator surface. Nature Communications. 8.
Xu, Yishuai, et al. “Disorder Enabled Band Structure Engineering of a Topological Insulator Surface.” Nature Communications, vol. 8, Nature Publishing Group, 2017, doi:10.1038/ncomms14081.

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