Investigating Electron-phonon Coupling in the van de Waals ferromagnet CrGeTe<sub>3</sub> by trARPES

Oral-In-person

Abstract

Electron–phonon coupling (EPC) underpins a variety of important phenomena in condensed matter, from charge density waves to superconductivity. Using time- and angle-resolved photoemission spectroscopy (trARPES) we study coherent and incoherent responses of EPC in the electronic band structure. In the van der Waals ferromagnet CrGeTe₃, magnon-phonon coupling has been revealed by raman spectroscopy and neutron scattering. We resolve three optical phonons at 2-4THz which are coupling to the zone-center hole pockets. The 2THz mode softens considerably with increasing excitation density. Future work aims at resolving signatures of the magnon-phonon coupling in the time-domain.

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Presenters

  • BO LIU

    • Stanford University

Authors

  • BO LIU

    • Stanford University

  • Lebing Chen

    • University of California, Berkeley

  • Noah Meyer

    • Stanford University

  • Qinda Guo

    • Stanford University

  • Denny Puntel

    • Stanford University

  • Bin Gao

    • Rice University

  • Pengcheng Dai

  • Robert Birgeneau

    • University of California, Berkeley

  • Jonathan Sobota

    • SLAC National Accelerator Laboratory

  • Patrick Kirchmann

    • SLAC National Accelerator Laboratory

  • Zhi-Xun Shen

    • Stanford University