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Effect of topology on quasiparticle interactions in the Weyl semimetal WP_2

机译：拓扑对Weyl Semimetal WP_2中Quasiparticle相互作用的影响

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摘要

We compare two crystallographic phases of the low-dimensional WP_2 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* = 20 K, which evidences a crossover in the topological phase from marginal quasiparticles to a coherent low-temperature regime. In contrast, the topologically trivial a phase shows more pronounced signatures of electron-phonon interaction, i.e., an enhanced phonon linewidth and deviations from conventional anharmonicily 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.
机译：我们比较低维WP_2的两个晶体相，以更好地了解拓扑系统中电子和电子 - 声子相互作用的特征。与拓扑α相比相比，拓扑β相，具有巨大磁阻的Weyl半型，具有更大的电子拉曼散射强度。这种强度折叠T

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  • 来源
    《Physical review》 |2020年第7期|075116.1-075116.9|共9页
  • 作者

    Dirk Wulferding; Peter Lemmens; Florian Buescher; David Schmeltzer; Claudia Felser; Chandra Shekhar;

  • 作者单位

    Institute for Condensed Matter Physics TU Braunschweig Mendelssohnstrasse 3 38106 Braunschweig Germany Laboratory for Emerging Nanometrology TU Braunschweig Langer Kamp 6 38106 Braunschweig Germany Center for Correlated Electron Systems Institute for Basic Science Seoul 08826 Republic of Korea;

    Institute for Condensed Matter Physics TU Braunschweig Mendelssohnstrasse 3 38106 Braunschweig Germany Laboratory for Emerging Nanometrology TU Braunschweig Langer Kamp 6 38106 Braunschweig Germany;

    Institute for Condensed Matter Physics TU Braunschweig Mendelssohnstrasse 3 38106 Braunschweig Germany Laboratory for Emerging Nanometrology TU Braunschweig Langer Kamp 6 38106 Braunschweig Germany;

    Physics Department City College of the City University of New York New York 10031 USA;

    Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

    Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

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