Discovery of Ĉ2 rotation anomaly in topological crystalline insulator SrPb

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Wenhui Fan
  • Simin Nie
  • Cuixiang Wang
  • Binbin Fu
  • Changjiang Yi
  • Shunye Gao
  • Zhicheng Rao
  • Dayu Yan
  • Ming Shi
  • Yaobo Huang
  • Youguo Shi
  • Tian Qian
  • Hong Ding

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Detail(s)

Original languageEnglish
Article number2052
Number of pages7
Journal / PublicationNature Communications
Volume12
Online published6 Apr 2021
Publication statusPublished - 2021

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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 Ĉn, 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 Ĉ2 rotation anomaly in a binary compound SrPb. Our first-principles calculations reveal two massless Dirac fermions protected by the combination of time-reversal symmetry and Ĉ2y on the (010) surface. Using angle-resolved photoemission spectroscopy, we identify two Dirac surface states inside the bulk band gap of SrPb, confirming the Ĉ2 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. New class of topological crystalline insulators (TCI) have been proposed, but are yet to be experimentally evidenced. Here, the authors evidence two massless Dirac fermions protected by the combination of time-reversal symmetry and Ĉ2y on the (010) surface of SrPb, confirming the Ĉ2 rotation anomaly in the new class of TCIs. The findings enrich the classification of topological phases, which pave the way for exploring exotic behavior of the new classes of TCIs.

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Citation Format(s)

Discovery of Ĉ2 rotation anomaly in topological crystalline insulator SrPb. / Fan, Wenhui; Nie, Simin; Wang, Cuixiang; Fu, Binbin; Yi, Changjiang; Gao, Shunye; Rao, Zhicheng; Yan, Dayu; Ma, Junzhang; Shi, Ming; Huang, Yaobo; Shi, Youguo; Wang, Zhijun; Qian, Tian; Ding, Hong.

In: Nature Communications, Vol. 12, 2052, 2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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