Effect of topology on quasiparticle interactions in the Weyl semimetal WP2

authored by: Dirk Wulferding, Peter Lemmens, Florian Büscher, David Schmeltzer, Claudia Felser, Chandra Shekhar
Abstract: We compare two crystallographic phases of the low-dimensional WP2 to better understand features of electron-electron and electron-phonon interactions in topological systems. The topological β phase, a Weyl semimetal with a giant magnetoresistance, shows a larger intensity of electronic Raman scattering compared to the topologically trivial α phase. This intensity collapses for T<T∗=20K, which evidences a crossover in the topological phase from marginal quasiparticles to a coherent low-temperature regime. In contrast, the topologically trivial α phase shows more pronounced signatures of electron-phonon interaction, i.e., an enhanced phonon linewidth and deviations from conventional anharmonicity in an intermediate-temperature regime. These effects provide evidence for an interesting interplay of electronic correlations and electron-phonon coupling. Interband and intraband electronic fluctuations can be distinguish by the energy range of electronic Raman scattering and their temperature dependence. Furthermore, we demonstrate a decisive dependency on symmetry that is critical to understand their interplay.
External Organisation(s): Technische Universität Braunschweig
Institute for Basic Science
City University of New York
Max Planck Institute for Chemical Physics of Solids (MPI CPfS)
Type: Article
Journal: Physical Review B
Volume: 102
ISSN: 2469-9950
Publication date: 15.08.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic version(s): https://doi.org/10.1103/PhysRevB.102.075116 (Access: Open)

BibTeX

@article{151ba5e415f744c8a178d0ba5b9ad174,
title = "Effect of topology on quasiparticle interactions in the Weyl semimetal WP2",
abstract = "We compare two crystallographic phases of the low-dimensional WP2 to better understand features of electron-electron and electron-phonon interactions in topological systems. The topological β phase, a Weyl semimetal with a giant magnetoresistance, shows a larger intensity of electronic Raman scattering compared to the topologically trivial α phase. This intensity collapses for T<T∗=20K, which evidences a crossover in the topological phase from marginal quasiparticles to a coherent low-temperature regime. In contrast, the topologically trivial α phase shows more pronounced signatures of electron-phonon interaction, i.e., an enhanced phonon linewidth and deviations from conventional anharmonicity in an intermediate-temperature regime. These effects provide evidence for an interesting interplay of electronic correlations and electron-phonon coupling. Interband and intraband electronic fluctuations can be distinguish by the energy range of electronic Raman scattering and their temperature dependence. Furthermore, we demonstrate a decisive dependency on symmetry that is critical to understand their interplay.",
author = "Dirk Wulferding and Peter Lemmens and Florian B{\"u}scher and David Schmeltzer and Claudia Felser and Chandra Shekhar",
note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = aug,
day = "15",
doi = "10.1103/PhysRevB.102.075116",
language = "English",
volume = "102",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "7",
}