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

Liu DF, Wei LY, Le CC, Wang HY, Zhang X, Kumar N, Shekhar C, Schroter NBM, Li YW, Pei D, Xu LX, Dudin P, Kim TK, Cacho C, Fujii J, Vobornik I, Wang MX, Yang LX, Liu ZK, Guo YF, Hu JP, Felser C, Parkin SSP, Chen YL (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Applied Physics AIP Publishing

Book Volume: 129

Article Number: 235109

Journal Issue: 23

DOI: 10.1063/5.0045466

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.

Involved external institutions

Tsinghua University CN China (CN) ShanghaiTech University / 上海科技大学 CN China (CN) University of Oxford GB United Kingdom (GB) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Diamond Light Source GB United Kingdom (GB) AREA Science Park IT Italy (IT) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN)

How to cite

APA:

Liu, D.F., Wei, L.Y., Le, C.C., Wang, H.Y., Zhang, X., Kumar, N.,... Chen, Y.L. (2021). Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi. Journal of Applied Physics, 129(23). https://doi.org/10.1063/5.0045466

MLA:

Liu, D. F., et al. "Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi." Journal of Applied Physics 129.23 (2021).

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