Wenhui Fan^1*, Simin Nie^2*, Cuixiang Wang^1*, Binbin Fu^1*, Changjiang Yi^1*, Shunye Gao^1*, Zhicheng Rao^1*, Dayu Yan^1*, Junzhang Ma^3*, Ming Shi^3*, Yaobo Huang^4*, Youguo Shi^1*, Zhijun Wang^1*, Tian Qian^1*, Hong Ding^1*

1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China.

2 Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.

3 Swiss Light Source, Paul Scherrer Institute, Villigen, PSI, Switzerland.

4 Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China.

* Corresponding authors emails: fanwenhui@iphy.ac.cn, smnie@stanford.edu, cxwang@iphy.ac.cn, fubb19900424@163.com, chjyi@iphy.ac.cn, gaoshunye@iphy.ac.cn, zcrao@iphy.ac.cn, dayuyan@iphy.ac.cn, junzhang.ma@psi.ch, ming.shi@psi.ch, huangyaobo@sinap.ac.cn, ygshi@iphy.ac.cn, wzj@iphy.ac.cn, tqian@iphy.ac.cn, dingh@iphy.ac.cn

DOI10.24435/materialscloud:zx-nv [version v1]

Publication date: Dec 24, 2021

How to cite this record

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, Hong Ding, Discovery of Ĉ₂ rotation anomaly in topological crystalline insulator SrPb, Materials Cloud Archive 2021.228 (2021), https://doi.org/10.24435/materialscloud:zx-nv

Description

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 Ĉ_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 Ĉ_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 T̂ and Ĉ_2y on the (010) surface. Using angle-resolved photoemission spectroscopy, we identify two Dirac surface states inside the bulk band gap of SrPb, confirming the Ĉ_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.

Materials Cloud sections using this data

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External references

Keywords

topological materials electronic structure MARVEL/DD6 SNSF