Mapping the unconventional orbital texture in topological crystalline insulators

Zeljkovic, 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, M. Zahid; Madhavan, Vidya

doi:10.1038/NPHYS3012

Title: Mapping the unconventional orbital texture in topological crystalline insulators

Journal Article · Sun Jul 13 00:00:00 EDT 2014 · Nature Physics

DOI:https://doi.org/10.1038/NPHYS3012· OSTI ID:1557723

Zeljkovic, Ilija ^[1]; Okada, Yoshinori ^[2]; Huang, Cheng -Yi ^[3]; Sankar, R. ^[4]; Walkup, Daniel ^[1]; Zhou, Wenwen ^[1]; Serbyn, Maksym ^[5]; Chou, Fangcheng ^[4]; Tsai, Wei -Feng ^[3]; Lin, Hsin ^[6]; Bansil, A. ^[1]; Fu, Liang ^[5]; Hasan, M. Zahid ^[7]; Madhavan, Vidya ^[1]

Boston College, Chestnut Hill, MA (United States)
Boston College, Chestnut Hill, MA (United States); Tohoku Univ., Sendai (Japan)
National Sun Yat-sen Univ., Kaohsiung (Taiwan)
National Taiwan Univ., Taipei (Taiwan)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
National Univ. of Singapore (Singapore)
Princeton Univ., Princeton, NJ (United States)

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 Pb_1–xSn_xSe, 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. Here, 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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0010526

OSTI ID:: 1557723

Journal Information:: Nature Physics, Vol. 10, Issue 8; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 71 works

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