Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

Zhicheng Jiang; Zhengtai Liu; Chenqiang Hua; Xiangqi Liu; Yichen Yang; Jianyang Ding; Jiayu Liu; Jishan Liu; Mao Ye; Ji Dai; Massimo Tallarida; Yanfeng Guo; Yunhao Lu; Dawei Shen

doi:10.1103/PhysRevMaterials.9.L031201

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Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

Zhicheng Jiang ^1,2,*, Zhengtai Liu ^1,3,*,†, Chenqiang Hua ^4,5,6,*, Xiangqi Liu^7,*, Yichen Yang⁸, Jianyang Ding⁸, Jiayu Liu⁸, Jishan Liu^1,3, Mao Ye^1,3 et al.

Ji Dai ⁹, Massimo Tallarida ⁹, Yanfeng Guo ^7,‡, Yunhao Lu^4,5,§, and Dawei Shen ^2,∥

¹Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
²National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
³National Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, Shanghai 200050, China
⁴Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China
⁵State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
⁶Beihang Hangzhou Innovation Institute Yuhang, Xixi Octagon City, Yuhang District, Hangzhou 310023, China
⁷School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
⁸State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
⁹ALBA Synchrotron Light Source, Barcelona 08290, Spain

^*These authors contributed equally to this work.
^†Contact author: liuzt@sari.ac.cn
^‡Contact author: guoyf@shanghaitech.edu.cn
^§Contact author: luyh@zju.edu.cn
^∥Contact author: dwshen@ustc.edu.cn

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Phys. Rev. Materials 9, L031201 – Published 25 March, 2025

DOI: https://doi.org/10.1103/PhysRevMaterials.9.L031201

Abstract

Chiral multifold fermions in solids exhibit unique band structures and topological properties, making them ideal for exploring fundamental physical phenomena related to nontrivial topology, chirality, and symmetry breaking. However, the challenge of obtaining clean, flat surfaces through cleavage has hindered the investigation of their unique electronic states. In this study, we utilize high-resolution angle-resolved photoemission spectroscopy and density functional theory calculations to investigate the low-energy electronic structure of the cleavable single-crystal PdSbSe. Our combined experimental and theoretical analysis reveals the presence of multifold-degenerate fermions within this chiral crystal. We also observe multiple chiral Fermi arc surface states and spin-splitting behavior in the associated bulk bands. These findings provide unique insights into chiral, multifold fermionic states in easily cleavable crystals and offer a robust platform for further research into their unique electronic properties and potential applications in novel electronic devices.

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Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

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Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

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