Electronic structures and photoemission spectroscopy

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Nodal s卤 pairing symmetry in an iron-based superconductor with only hole pockets

Nature Physics 20 (4), 571-578

Authors:

Dingsong Wu, Junjie Jia, Jiangang Yang, Wenshan Hong, Yingjie Shu, Taimin Miao, Hongtao Yan, Hongtao Rong, Ping Ai, Xing Zhang, Chaohui Yin, Jieyi Liu, Houke Chen, Yiheng Yang, Cheng Peng, Chenlong Li, Shenjin Zhang, Fengfeng Zhang, Feng Yang, Zhimin Wang, Nan Zong, Lijuan Liu, Rukang Li, Xiaoyang Wang, Qinjun Peng, Hanqing Mao, Guodong Liu, Shiliang Li, Yulin Chen, Huiqian Luo, Xianxin Wu, Zuyan Xu, Lin Zhao, XJ Zhou

Abstract:

Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4

Nature Communications 14 (1), 8089

Authors:

Wenxuan Zhao, Ming Yang, Runzhe Xu, Xian Du, Yidian Li, Kaiyi Zhai, Cheng Peng, Ding Pei, Han Gao, Yiwei Li, Lixuan Xu, Junfeng Han, Yuan Huang, Zhongkai Liu, Yugui Yao, Jincheng Zhuang, Yi Du, Jinjian Zhou, Yulin Chen, Lexian Yang

Abstract:

Topological electronic structure and spin texture of quasi-one-dimensional higher-order topological insulator Bi4Br4

Nature Communications Nature Research 14:1 (2023) 8089

Authors:

Wenxuan Zhao, Ming Yang, Runzhe Xu, Xian Du, Kaiyi Zhai, Cheng Peng, Ding Pei, Han Gao, Lixuan Xu, Junfeng Han, Yuan Huang, Zhongkai Liu, Yugui Yao, Jincheng Zhuang, Yi Du, Jinjian Zhou, Yulin Chen, Lexian Yang, Yidian Li

Abstract:

Abstract The notion of topological insulators (TIs), characterized by an insulating bulk and conducting topological surface states, can be extended to higher-order topological insulators (HOTIs) hosting gapless modes localized at the boundaries of two or more dimensions lower than the insulating bulk. In this work, by performing high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements with submicron spatial and spin resolution, we systematically investigate the electronic structure and spin texture of quasi-one-dimensional (1D) HOTI candidate Bi 4 Br 4 . In contrast to the bulk-state-dominant spectra on the (001) surface, we observe gapped surface states on the (100) surface, whose dispersion and spin-polarization agree well with our ab-initio calculations. Moreover, we reveal in-gap states connecting the surface valence and conduction bands, which is a signature of the hinge states inside the (100) surface gap. Our findings provide compelling evidence for the HOTI phase of Bi 4 Br 4 . The identification of the higher-order topological phase promises applications based on 1D spin-momentum locked current in electronic and spintronic devices.

Pressure-induced superconductivity in the Zintl topological insulator SrIn2As2

Physical Review B American Physical Society (APS) 108:22 (2023) 224510

Authors:

Weizheng Cao, Haifeng Yang, Yongkai Li, Cuiying Pei, Qi Wang, Yi Zhao, Changhua Li, Mingxin Zhang, Shihao Zhu, Juefei Wu, Lili Zhang, Zhiwei Wang, Yugui Yao, Zhongkai Liu, Yulin Chen, Yanpeng Qi

Correction to: Measurement of the electronic structure of a type-II topological Dirac semimetal candidate VAl3 using angle-resolved photoelectron spectroscopy

Tungsten Springer Nature 5:4 (2023) 608-608

Authors:

Hong-Wei Fang, Ai-Ji Liang, Niels BM Schr枚ter, Sheng-Tao Cui, Zhong-Kai Liu, Yu-Lin Chen