Abstract
We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, MoTe2, that alter its bare bands in a wide range of energy and momentum. Our quasiparticle interference patterns measured using scanning tunneling microscopy are shown to match the joint density of states of quasiparticle energy bands including momentum-dependent self-energy corrections, while electronic energy bands based on the other simpler local approximations of the Coulomb interaction fail to explain neither the correct number of quasiparticle pockets nor the shape of their dispersions observed in our spectrum. With this, we predict a transition between type-I and type-II Weyl fermions with doping and resolve its disparate quantum oscillation experiments, thus highlighting the critical roles of Coulomb interactions in layered Weyl semimetals.
| Original language | English |
|---|---|
| Article number | 045143 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 15 2022 |
| Externally published | Yes |
Funding
Y.-W.S. was supported by the National Research Foundation of Korea (NRF) (Grant No. 2017R1A5A1014862, SRC program: vdWMRC center) and KIAS individual Grant No. (CG031509). S.J. was supported by the NRF (2020R1A5A1016518 & 2020R1F1A1067268) and Samsung Advanced Institute of Technology (SAIT). S.C. was supported by the Basic Science Research Program of the NRF (2020R1A2C2003377). The experiment data analysis was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. H.-J.K. acknowledges financial support from the Alexander von Humboldt Foundation (No. KOR 1211335 HFST-P). We thank the CAC of KIAS for providing computing for this work.