journal article·2022-01-31Open access

Reshaped Weyl fermionic dispersions driven by Coulomb interactions in MoTe2

Seoung-Hun Kang, Sangjun Jeon, Hyun-Jung Kim, Wonhee Ko, Suyeon Cho, Se Hwang Kang, Sung Wng Kim, Heejun Yang, Hyo Won Kim, Young-Woo Son

Physical Review B· Volume 105· Issue 4

Abstract

We report the direct evidence of impacts of the Coulomb interaction in a prototypical Weyl semimetal, ${\mathrm{MoTe}}2$, 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.
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Research context

OpenAlex topics: Topological Materials and Phenomena · 2D Materials and Applications · Graphene research and applications

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Affiliations

Korea Institute for Advanced Study, Seoul 02455, Korea

Department of Physics, Chung-Ang University, Seoul 06974, Korea

Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

Samsung Advanced Institute of Technology, Suwon 16678, Korea

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Department of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Korea

Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea

Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea

Funding

National Research Foundation of Korea · Samsung Advanced Institute of Technology · U.S. Department of Energy · Alexander von Humboldt-Stiftung

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