Discovery of $${\hat{\boldsymbol{C}}}_2$$ C ̂ 2 rotation anomaly in topological crystalline insulator SrPb

Wenhui Fan, Simin Nie, Cuixiang Wang, Binbin Fu, Changjiang Yi, Shunye Gao, Zhicheng Rao, Dayu Yan, Junzhang Ma, Ming Shi, Yaobo Huang, Youguo Shi (), Zhijun Wang (), Tian Qian () and Hong Ding
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Wenhui Fan: Chinese Academy of Sciences
Simin Nie: Stanford University
Cuixiang Wang: Chinese Academy of Sciences
Binbin Fu: Chinese Academy of Sciences
Changjiang Yi: Chinese Academy of Sciences
Shunye Gao: Chinese Academy of Sciences
Zhicheng Rao: Chinese Academy of Sciences
Dayu Yan: Chinese Academy of Sciences
Junzhang Ma: City University of Hong Kong
Ming Shi: Paul Scherrer Institute
Yaobo Huang: Chinese Academy of Sciences
Youguo Shi: Chinese Academy of Sciences
Zhijun Wang: Chinese Academy of Sciences
Tian Qian: Chinese Academy of Sciences
Hong Ding: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Topological crystalline insulators (TCIs) are insulating electronic states with nontrivial topology protected by crystalline symmetries. Recently, theory has proposed new classes of TCIs protected by rotation symmetries $$\hat C_n$$ C ̂ n , which have surface rotation anomaly evading the fermion doubling theorem, i.e., n instead of 2n Dirac cones on the surface preserving the rotation symmetry. Here, we report the first realization of the $$\hat C_2$$ C ̂ 2 rotation anomaly in a binary compound SrPb. Our first-principles calculations reveal two massless Dirac fermions protected by the combination of time-reversal symmetry $$\hat T$$ T ̂ and $$\hat C_{2y}$$ C ̂ 2 y on the (010) surface. Using angle-resolved photoemission spectroscopy, we identify two Dirac surface states inside the bulk band gap of SrPb, confirming the $$\hat C_2$$ C ̂ 2 rotation anomaly in the new classes of TCIs. The findings enrich the classification of topological phases, which pave the way for exploring exotic behavior of the new classes of TCIs.

Date: 2021
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DOI: 10.1038/s41467-021-22350-6

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