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

Liu, D. F.; Wei, L. Y.; Le, C. C.; Wang, H. Y.; Zhang, X.; Kumar, N.; Shekhar, C.; Schröter, N. B. M.; Li, Y. W.; Pei, D.; Xu, L. X.; Dudin, P.; Kim, T. K.; Cacho, C.; Fujii, J.; Vobornik, I.; Wang, M. X.; Yang, L. X.; Liu, Z. K.; Guo, Y. F.; Hu, J. P.; Felser, C.; Parkin, S. S. P.; Chen, Y. L.

doi:10.1063/5.0045466

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

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Liu, D. F.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin, S. S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1063/5.0045466
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https://arxiv.org/abs/2102.08433
(Preprint)

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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. doi:10.1063/5.0045466.

Cite as: https://hdl.handle.net/21.11116/0000-0009-2FBD-F

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.