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

ORAL

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.

*Use of the LCLS and SSRL, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) under contract DE-AC02-76SF00515. B.L., N.M., D.P., Q.G., P.S.K, J.A.S, and Z.-X.S. were supported by the DOE-BES Division of Materials Sciences and Engineering under contract DE-AC02-76SF00515.

–

Presenters

  • BO LIU

    • Stanford University

Authors

  • BO LIU

    • Stanford University

  • Lebing Chen

    • University of California, Berkeley

  • Noah Matthew Meyer

    • Stanford University

  • Qinda Guo

    • Stanford University

  • Denny Puntel

    • Stanford University

  • Bin Gao

    • Rice University

  • Pengcheng Dai

    • Rice University

  • Robert J Birgeneau

    • University of California, Berkeley

  • Jonathan A Sobota

    • SLAC National Accelerator Laboratory

  • Patrick S Kirchmann

    • SLAC National Accelerator Laboratory

  • Zhi-Xun Shen

    • Stanford University