Electronic structures and photoemission spectroscopy

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Electron correlation and incipient flat bands in the Kagome superconductor CsCr3Sb5

Nature Communications 16 (1), 3229

Authors:

Yidian Li, Yi Liu, Xian Du, Siqi Wu, Wenxuan Zhao, Kaiyi Zhai, Yinqi Hu, Senyao Zhang, Houke Chen, Jieyi Liu, Yiheng Yang, Cheng Peng, Makoto Hashimoto, Donghui Lu, Zhongkai Liu, Yilin Wang, Yulin Chen, Guanghan Cao, Lexian Yang

Abstract:

Superconductivity in Trilayer Nickelate La4Ni3O10 under Pressure

Physical Review X American Physical Society (APS) 15:2 (2025) 021005

Authors:

Mingxin Zhang, Cuiying Pei, Di Peng, Xian Du, Weixiong Hu, Yantao Cao, Qi Wang, Juefei Wu, Yidian Li, Huanyu Liu, Chenhaoping Wen, Jing Song, Yi Zhao, Changhua Li, Weizheng Cao, Shihao Zhu, Qing Zhang, Na Yu, Peihong Cheng, Lili Zhang, Zhiwei Li, Jinkui Zhao, Yulin Chen, Changqing Jin, Hanjie Guo, Congjun Wu, Fan Yang, Qiaoshi Zeng, Shichao Yan, Lexian Yang, Yanpeng Qi

Tunable anomalous Hall effect by selective mirror symmetry breaking in the kagome magnet GdMn6Ge6

Physical Review B American Physical Society (APS) 111:16 (2025) l161114

Authors:

Zicheng Tao, Tianye Yu, Jianyang Ding, Zhicheng Jiang, Zhenhai Yu, Wei Xia, Xia Wang, Xuerong Liu, Yulin Chen, Dawei Shen, Yan Sun, Yanfeng Guo

Dual topology and versatile Rashba-split surface state configurations in 2M-WS2 and 2M-WSe2

Physical Review B American Physical Society 111:11 (2025) 115151

Authors:

Lixuan Xu, Yuqiang Fang, Fuqiang Huang, Shihao Zhang, Shiheng Liang, Yulin Chen, Lexian Yang, Zhongkai Liu, Nan Xu, Yiwei Li

Abstract:

The 2â¢M-phase transition metal dichalcogenides have recently attracted intensive research interest due to their rich topological and superconducting phase diagrams. Apart from the topological surface states of 2â¢M−Wâ¢S2 near Γ that originated from the strong topological order, using angle-resolved photoemission spectroscopy, we discover additional Rashba-split states on the surfaces of both 2â¢M−Wâ¢S2 and 2â¢M−W³§±ð2, which extend in large momentum-energy regions. First-principles calculations well reproduce these states and attribute them to the weak topological orders. The calculations further indicate that the surface state connecting configurations are tunable under moderate pressure, suggesting that 2â¢M−Wâ¢S2 and WSe2 are promising platforms to study topological phase transition and explore topological superconductivity.

High-temperature surface state in Kondo insulator U<sub>3</sub>Bi<sub>4</sub>Ni<sub>3</sub>

Science Advances American Association for the Advancement of Science 11:12 (2025) eadq9952

Authors:

Christopher Broyles, Xiaohan Wan, Wenting Cheng, Dingsong Wu, Hengxin Tan, Qiaozhi Xu, Shannon L Gould, Hasan Siddiquee, Leyan Xiao, Ryan Chen, Wanyue Lin, Yuchen Wu, Prakash Regmi, Yun Suk Eo, Jieyi Liu, Yulin Chen, Binghai Yan, Kai Sun, Sheng Ran

Abstract:

The resurgence of interest in Kondo insulators has been driven by two major mysteries: the presence of metallic surface states and the observation of quantum oscillations. To further explore these mysteries, it is crucial to investigate another similar system beyond the two existing ones, SmB6 and YbB12. Here, we address this by reporting on a Kondo insulator, U3Bi4Ni3. Our transport measurements reveal that a surface state emerges below 250 kelvin and dominates transport properties below 150 kelvin, which is well above the temperature scale of SmB6 and YbB12. At low temperatures, the surface conductivity is about one order of magnitude higher than the bulk. The robustness of the surface state indicates that it is inherently protected. The similarities and differences between U3Bi4Ni3 and the other two Kondo insulators will provide valuable insights into the nature of metallic surface states in Kondo insulators and their interplay with strong electron correlations.