Electronic structures and photoemission spectroscopy

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Controlling charge density order in 2H-TaSe2 using a van Hove singularity

Physical Review Research American Physical Society (APS) 6:1 (2024) 013088

Authors:

WRB Luckin, Y Li, J Jiang, SM Gunasekera, C Wen, Y Zhang, D Prabhakaran, F Flicker, Y Chen, M Mucha-Kruczyński
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Extraction of Spatiotemporal Information of Rainfall-Induced Landslides from Remote Sensing

REMOTE SENSING 16:16 (2024) ARTN 3089

Authors:

Tongxiao Zeng, Jun Zhang, Yulin Chen, Shaonan Zhu
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Nodal s± 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

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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

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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.
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