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Title: Mapping the unconventional orbital texture in topological crystalline insulators

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. 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.

Authors:
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [4];  [3];  [6];  [1];  [5];  [7];  [1]
  1. Boston College, Chestnut Hill, MA (United States)
  2. Boston College, Chestnut Hill, MA (United States); Tohoku Univ., Sendai (Japan)
  3. National Sun Yat-sen Univ., Kaohsiung (Taiwan)
  4. National Taiwan Univ., Taipei (Taiwan)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. National Univ. of Singapore (Singapore)
  7. Princeton Univ., Princeton, NJ (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1557723
Grant/Contract Number:  
SC0010526
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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, and Madhavan, Vidya. Mapping the unconventional orbital texture in topological crystalline insulators. United States: N. p., 2014. Web. doi:10.1038/NPHYS3012.
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. Mapping the unconventional orbital texture in topological crystalline insulators. United States. https://doi.org/10.1038/NPHYS3012
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, and Madhavan, Vidya. Sun . "Mapping the unconventional orbital texture in topological crystalline insulators". United States. https://doi.org/10.1038/NPHYS3012. https://www.osti.gov/servlets/purl/1557723.
@article{osti_1557723,
title = {Mapping the unconventional orbital texture in topological crystalline insulators},
author = {Zeljkovic, Ilija and Okada, Yoshinori and Huang, Cheng -Yi and Sankar, R. and Walkup, Daniel and Zhou, Wenwen and Serbyn, Maksym and Chou, Fangcheng and Tsai, Wei -Feng and Lin, Hsin and Bansil, A. and Fu, Liang and Hasan, M. Zahid and Madhavan, Vidya},
abstractNote = {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. 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.},
doi = {10.1038/NPHYS3012},
journal = {Nature Physics},
number = 8,
volume = 10,
place = {United States},
year = {Sun Jul 13 00:00:00 EDT 2014},
month = {Sun Jul 13 00:00:00 EDT 2014}
}

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