TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.15.4.178
TI  - Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons
PY  - 2023/10/25
UR  - https://www.scipost.org/SciPostPhys.15.4.178
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 15
IS  - 4
SP  - 178
A1  - Nayak, Abhay Kumar
AU  - Reiner, Jonathan
AU  - Tan, Hengxin
AU  - Fu, Huixia
AU  - Ling, Henry
AU  - Shekhar, Chandra
AU  - Felser, Claudia
AU  - Pereg-Barnea, Tami
AU  - Yan, Binghai
AU  - Beidenkopf, Haim
AU  - Avraham, Nurit
AB  - 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 $\sim (E)^{-0.7}$. 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.
ER  -

@Article{10.21468/SciPostPhys.15.4.178,
	title={{Visualizing near-coexistence of massless Dirac electrons and ultra-massive saddle point electrons}},
	author={Abhay Kumar Nayak and Jonathan Reiner and Hengxin Tan and Huixia Fu and Henry Ling and Chandra Shekhar and Claudia Felser and Tamar (Tami) Pereg-Barnea and Binghai Yan and Haim Beidenkopf and Nurit Avraham},
	journal={SciPost Phys.},
	volume={15},
	pages={178},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.15.4.178},
	url={https://scipost.org/10.21468/SciPostPhys.15.4.178},
}