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Title: Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator

Abstract

In topological crystalline insulators (TCIs), topology and crystal symmetry intertwine to create surface states with distinct characteristics. The breaking of crystal symmetry in TCIs is predicted to impart mass to the massless Dirac fermions. Here, we report high-resolution scanning tunneling microscopy studies of a TCI, Pb1-xSnxSe that reveal the coexistence of zero-mass Dirac fermions protected by crystal symmetry with massive Dirac fermions consistent with crystal symmetry breaking. In addition, we show two distinct regimes of the Fermi surface topology separated by a Van-Hove singularity at the Lifshitz transition point. Our work paves the way for engineering the Dirac band gap and realizing interaction-driven topological quantum phenomena in TCIs.

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [5];  [3];  [6];  [6];  [3];  [5];  [4];  [2];  [4]
  1. Boston College, Chestnut Hill, MA (United States); Tohoku Univ., Sendai (Japan)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Northeastern Univ., Boston, MA (United States)
  4. Boston College, Chestnut Hill, MA (United States)
  5. Princeton Univ., NJ (United States)
  6. National Taiwan Univ., Taipei (Taiwan)
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:
1557595
Grant/Contract Number:  
SC0010526
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 341; Journal Issue: 6153; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Okada, Yoshinori, Serbyn, Maksym, Lin, Hsin, Walkup, Daniel, Zhou, Wenwen, Dhital, Chetan, Neupane, Madhab, Xu, Suyang, Wang, Yung Jui, Sankar, R., Chou, Fangcheng, Bansil, Arun, Hasan, M. Zahid, Wilson, Stephen D., Fu, Liang, and Madhavan, Vidya. Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator. United States: N. p., 2013. Web. doi:10.1126/science.1239451.
Okada, Yoshinori, Serbyn, Maksym, Lin, Hsin, Walkup, Daniel, Zhou, Wenwen, Dhital, Chetan, Neupane, Madhab, Xu, Suyang, Wang, Yung Jui, Sankar, R., Chou, Fangcheng, Bansil, Arun, Hasan, M. Zahid, Wilson, Stephen D., Fu, Liang, & Madhavan, Vidya. Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator. United States. https://doi.org/10.1126/science.1239451
Okada, Yoshinori, Serbyn, Maksym, Lin, Hsin, Walkup, Daniel, Zhou, Wenwen, Dhital, Chetan, Neupane, Madhab, Xu, Suyang, Wang, Yung Jui, Sankar, R., Chou, Fangcheng, Bansil, Arun, Hasan, M. Zahid, Wilson, Stephen D., Fu, Liang, and Madhavan, Vidya. Thu . "Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator". United States. https://doi.org/10.1126/science.1239451. https://www.osti.gov/servlets/purl/1557595.
@article{osti_1557595,
title = {Observation of Dirac Node Formation and Mass Acquisition in a Topological Crystalline Insulator},
author = {Okada, Yoshinori and Serbyn, Maksym and Lin, Hsin and Walkup, Daniel and Zhou, Wenwen and Dhital, Chetan and Neupane, Madhab and Xu, Suyang and Wang, Yung Jui and Sankar, R. and Chou, Fangcheng and Bansil, Arun and Hasan, M. Zahid and Wilson, Stephen D. and Fu, Liang and Madhavan, Vidya},
abstractNote = {In topological crystalline insulators (TCIs), topology and crystal symmetry intertwine to create surface states with distinct characteristics. The breaking of crystal symmetry in TCIs is predicted to impart mass to the massless Dirac fermions. Here, we report high-resolution scanning tunneling microscopy studies of a TCI, Pb1-xSnxSe that reveal the coexistence of zero-mass Dirac fermions protected by crystal symmetry with massive Dirac fermions consistent with crystal symmetry breaking. In addition, we show two distinct regimes of the Fermi surface topology separated by a Van-Hove singularity at the Lifshitz transition point. Our work paves the way for engineering the Dirac band gap and realizing interaction-driven topological quantum phenomena in TCIs.},
doi = {10.1126/science.1239451},
journal = {Science},
number = 6153,
volume = 341,
place = {United States},
year = {2013},
month = {8}
}

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