Mapping the unconventional orbital texture in topological crystalline insulators
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Author(s)
Zeljkovic, Ilija
Okada, Yoshinori
Huang, Cheng-Yi
Sankar, R.
Walkup, Daniel
Zhou, Wenwen
Serbyn, Maksym
Chou, Fangcheng
Tsai, Wei-Feng
Lin, Hsin
Date Issued
July 2014
Journal
Nature Physics
Publisher
Nature Publishing Group
Citation
Zeljkovic, Ilija, Yoshinori Okada, Cheng-Yi Huang, R. Sankar, Daniel Walkup, Wenwen Zhou, Maksym Serbyn, et al. “Mapping the Unconventional Orbital Texture in Topological Crystalline Insulators.” Nat Phys 10, no. 8 (July 13, 2014): 572–577.
Version
Original manuscript
Abstract
The newly discovered topological crystalline insulators feature a complex band structure involving multiple Dirac cones [superscript 1, 2, 3, 4, 5, 6], 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 character7. However, their orbital texture, which is of immense importance in determining a variety of a material’s properties [superscript 8, 9, 10] remains elusive. Here, we unveil the orbital texture of Pb[subscript 1−x]Sn[subscript x]Se, 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 [superscript 11] and establish the orbital nature of the Dirac bands, which could provide an alternative pathway towards future quantum applications.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/nphys3012
