Dynamics of an order parameter coupled phonon in an excitonic insulator

ORAL

Abstract

An impulsively stimulated Raman active phonon can be suppressed or amplified using two optical pulses tailored to be period-matched with this certain mode. Ta2NiSe5 is an excitonic insulator candidate which exhibits multiple coherent phonons in transient reflectivity. We conducted double-pump coherent phonon spectroscopy measurements on Ta2NiSe5 to understand the interaction between the phonon and the excitonic order parameter. We further developed theoretical methods to simulate the dynamics of the order parameter coupled phonon.

–

Presenters

  • Honglie Ning

    • Institute for Quantum Information and Matter, California Institute of Technology

Authors

  • Honglie Ning

    • Institute for Quantum Information and Matter, California Institute of Technology

  • Omar Mehio

    • Institute for Quantum Information and Matter, California Institute of Technology

  • Michael Buchhold

    • Institute for Quantum Information and Matter, California Institute of Technology
    • Caltech

  • Takashi Kurumaji

    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Joseph G Checkelsky

    • Department of Physics, Massachusetts Institute of Technology
    • Department of Physics, Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Physics, MIT

  • Gil Refael

    • Caltech
    • Institute for Quantum Information and Matter, California Institute of Technology
    • Institute of Quantum Information and Matter and Department of Physics, California Institute of Technology, Pasadena, California 91125, USA

  • David Hsieh

    • Institute for Quantum Information and Matter, California Institute of Technology
    • Caltech
    • Department of Physics, California Institute of Technology