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

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Le,  C. C.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kumar,  N.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shekhar,  C.
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Liu, D. F., Wei, L. Y., Le, C. C., Wang, H. Y., Zhang, X., Kumar, N., et al. (2021). Observation of the critical state to multiple-type Dirac semimetal phases in KMgBi. Journal of Applied Physics, 129(23): 235109, pp. 1-7. doi:10.1063/5.0045466.


Cite as: https://hdl.handle.net/21.11116/0000-0008-E992-C
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. © 2021 Author(s).