Chiral fermion reversal in chiral crystals

Hang Li, Sheng Xu, Zhi-Cheng Rao, Li-Qin Zhou, Zhi-Jun Wang, Shi-Ming Zhou, Shang-Jie Tian, Shun-Ye Gao, Jia-Jun Li, Yao-Bo Huang, He-Chang Lei, Hong-Ming Weng, Yu-Jie Sun (), Tian-Long Xia (), Tian Qian () and Hong Ding
Additional contact information
Hang Li: Chinese Academy of Sciences
Sheng Xu: Renmin University of China
Zhi-Cheng Rao: Chinese Academy of Sciences
Li-Qin Zhou: Chinese Academy of Sciences
Zhi-Jun Wang: Chinese Academy of Sciences
Shi-Ming Zhou: University of Science and Technology of China
Shang-Jie Tian: Renmin University of China
Shun-Ye Gao: Chinese Academy of Sciences
Jia-Jun Li: Chinese Academy of Sciences
Yao-Bo Huang: Chinese Academy of Sciences
He-Chang Lei: Renmin University of China
Hong-Ming Weng: Chinese Academy of Sciences
Yu-Jie Sun: Chinese Academy of Sciences
Tian-Long Xia: Renmin University of China
Tian Qian: Chinese Academy of Sciences
Hong Ding: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract In materials chiral fermions such as Weyl fermions are characterized by nonzero chiral charges, which are singular points of Berry curvature in momentum space. Recently, new types of chiral fermions beyond Weyl fermions have been discovered in structurally chiral crystals CoSi, RhSi and PtAl. Here, we have synthesized RhSn single crystals, which have opposite structural chirality to the CoSi crystals we previously studied. Using angle-resolved photoemission spectroscopy, we show that the bulk electronic structures of RhSn are consistent with the band calculations and observe evident surface Fermi arcs and helical surface bands, confirming the existence of chiral fermions in RhSn. It is noteworthy that the helical surface bands of the RhSn and CoSi crystals have opposite handedness, meaning that the chiral fermions are reversed in the crystals of opposite structural chirality. Our discovery establishes a direct connection between chiral fermions in momentum space and chiral lattices in real space.

Date: 2019
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DOI: 10.1038/s41467-019-13435-4

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