Electronic structures and photoemission spectroscopy

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Charge Density Wave Orders and Enhanced Superconductivity under Pressure in the Kagome Metal CsV3Sb5

Advanced Materials Wiley 33:42 (2021) e2102813

Authors:

Qi Wang, Pengfei Kong, Wujun Shi, Cuiying Pei, Chenhaoping Wen, Lingling Gao, Yi Zhao, Qiangwei Yin, Yueshen Wu, Gang Li, Hechang Lei, Jun Li, Yulin Chen, Shichao Yan, Yanpeng Qi

Anomalous Hall effect in ferrimagnetic metal RMn6Sn6 (R = Tb, Dy, Ho) with clean Mn kagome lattice

Applied Physics Letters AIP Publishing 119:9 (2021) 092405

Authors:

Lingling Gao, Shiwei Shen, Qi Wang, Wujun Shi, Yi Zhao, Changhua Li, Weizheng Cao, Cuiying Pei, Jun-Yi Ge, Gang Li, Jun Li, Yulin Chen, Shichao Yan, Yanpeng Qi

Measurement of Superconductivity and Edge States in Topological Superconductor Candidate TaSe3 Supported by the National Key R&D Program of China (Grant No. 2017YFA0305400), the Shanghai Technology Innovation Action Plan 2020-Integrated Circuit Technology Support Program (Grant No. 20DZ1100605), the National Natural Science Foundation of China (Grant Nos. 52072168, 21733001, 51861145201, U1932217, and 11974246), the National Key Basic Research Program of China (Grant No. 2018YFA0306200), and the Science and Technology Commission of Shanghai Municipality (Grant No. 19JC1413900).

Chinese Physics Letters IOP Publishing 38:7 (2021) 077302

Authors:

Shuai Liu, Si-Min Nie, Yan-Peng Qi, Yan-Feng Guo, Hong-Tao Yuan, Le-Xian Yang, Yu-Lin Chen, Mei-Xiao Wang, Zhong-Kai Liu

Experimental evidence for a metastable state in FeTe1−x Se x following coherent-phonon excitation

Journal of Electron Spectroscopy and Related Phenomena Elsevier 250 (2021) 147085

Authors:

LX Yang, G Rohde, YJ Chen, WJ Shi, ZK Liu, F Chen, YL Chen, K Rossnagel, M Bauer

Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi

Journal of Applied Physics American Institute of Physics 129:23 (2021) 235109

Authors:

DF Liu, LY Wei, CC Le, HY Wang, X Zhang, N Kumar, C Shekhar, NBM Schröter, YW Li, D Pei, LX Xu, P Dudin, TK Kim, C Cacho, J Fujii, I Vobornik, MX Wang, LX Yang, ZK Liu, YF Guo, JP Hu, C Felser, SSP Parkin, YL Chen

Abstract:

Dirac semimetals are classified into different phases based on the types of Dirac fermions. Tuning the transition among different types of Dirac fermions in one system remains a challenge. Recently, KMgBi was predicted to be located at a critical state in which various types of Dirac fermions can be induced owing to the existence of a flatband. Here, we carried out systematic studies on the electronic structure of KMgBi single crystals by combining angle-resolve photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. The flatband was clearly observed near the Fermi level. We also revealed a small bandgap of ∼20 meV between the flatband and the conduction band. These results demonstrate the critical states of KMgBi that transition among various types of Dirac fermions can be tuned in one system.