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Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons

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

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

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Citation

Nayak, A. K., Reiner, J., Tan, H., Fu, H., Ling, H., Shekhar, C., et al. (2023). Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons. SciPost Physics, 15: 178, pp. 1-18. doi:10.21468/SciPostPhys.15.4.178.


Cite as: https://hdl.handle.net/21.11116/0000-000D-EC6E-F
Abstract
Strong singularities in the electronic density of states amplify correlation effects and play a key role in determining the ordering instabilities in various materials. Recently high order van Hove singularities (VHSs) with diverging power-law scaling have been classified in single-band electron models. We show that the 110 surface of Bismuth exhibits high order VHS with an usually high density of states divergence ∼ (E)−0.7. Detailed mapping of the surface band structure using scanning tunneling microscopy and spectroscopy combined with first-principles calculations show that this singularity occurs in close proximity to Dirac bands located at the center of the surface Brillouin zone. The enhanced power-law divergence is shown to originate from the anisotropic flattening of the Dirac band just above the Dirac node. Such near-coexistence of massless Dirac electrons and ultra-massive saddle points enables to study the interplay of high order VHS and Dirac fermions. Copyright A. K. Nayak et al.