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Electron-phonon coupling in the magnetic Weyl semimetal Zr Co$_{2}$ Sn

Sklyadneva, I.Yu.; Heid, R.; Echenique, P. M.; Chulkov, E. V.

Abstract (englisch):
Electron-phonon coupling in ZrCo2Sn is investigated within the density-functional theory and linear-response approach in the mixed-basis pseudopotential representation. Phonon-induced scattering is analyzed for excited electrons (holes) in two majority bands, which form the topological Weyl state. Although the electron-phonon coupling in the energy range under consideration demonstrates some dependence on the available phase space, the strength of the phonon-mediated scattering, λ, changes rather weakly with the hole (electron) energy and momentum, varying between 0.1 and 0.3. The momentum-averaged value of λ ranges from 0.25 to 0.45. The phonon-mediated scattering of electrons near the Weyl point is found to be weak enough to warrant well-defined quasiparticles. Most of the modes actively involved in electron scattering are middle- and high-frequency lattice vibrations, while the participation of low-energy acoustic phonons is significantly suppressed by electron-phonon matrix elements. Of the long-wavelength optical phonons, only the T2g Raman active modes generated by opposite vibrations of Co atoms make a noticeable contribution to the scattering of electrons.

DOI: 10.1103/PhysRevB.103.024303
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 25.01.2021
Sprache Englisch
Identifikator ISSN: 2469-9950, 2469-9969
KITopen-ID: 1000128951
HGF-Programm 43.21.01 (POF IV, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical review / B
Verlag American Physical Society (APS)
Band 103
Heft 2
Seiten 024303
Vorab online veröffentlicht am 12.01.2021
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