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Mapping the unconventional orbital texture in topological crystalline insulators

TitleMapping the unconventional orbital texture in topological crystalline insulators
Publication TypeJournal Article
Year of Publication2014
AuthorsZeljkovic, Ilija, Okada Yoshinori, Huang Cheng-Yi, Sankar R., Walkup Daniel, Zhou Wenwen, Serbyn Maksym, Chou Fangcheng, Tsai Wei-Feng, Lin Hsin, Bansil A., Fu Liang, Hasan Zahid M., and Madhavan Vidya
JournalNature Physics
Volume10
Pagination572–577
Date Published08/2014
ISSN1745-2473
Abstract

The newly discovered topological crystalline insulators feature a complex band structure involving multiple Dirac cones, and are potentially highly tunable by external electric field, temperature or strain. Theoretically, it has been predicted that the various Dirac cones, which are offset in energy and momentum, might harbour vastly different orbital character. However, their orbital texture, which is of immense importance in determining a variety of a material’s properties remains elusive. Here, we unveil the orbital texture of Pb1−{xSnxSe}, a prototypical topological crystalline insulator. By using Fourier-transform scanning tunnelling spectroscopy we measure the interference patterns produced by the scattering of surface-state electrons. We discover that the intensity and energy dependences of the Fourier transforms show distinct characteristics, which can be directly attributed to orbital effects. Our experiments reveal a complex band topology involving two Lifshitz transitions and establish the orbital nature of the Dirac bands, which could provide an alternative pathway towards future quantum applications.

URLhttp://www.nature.com/nphys/journal/v10/n8/full/nphys3012.html
DOI10.1038/nphys3012

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