Disentangling Amplitude and Phase Dynamics in Nonequilibrium Charge Density Wave Formation

ORAL

Abstract

At thermal equilibrium, a broken symmetry phase characterized by a complex order parameter often develops fluctuating order with a finite amplitude above the transition temperature Tc. This is particularly pronounced in low-dimensional systems, where short-range, fluctuating order establishes its long-range phase coherence only below Tc. By using an intense laser pulse that transiently restores the high-symmetry state, we study the nonequilibrium version of such a phase transition on a prototypical charge density wave compound LaTe3. With a combination of time-resolved diffraction, optical, and spectroscopic measurements, we can monitor how the amplitude and phase of the order parameter separately recover with distinct signatures in both coherent and incoherent responses after the photoexcitation. The present work provides a comprehensive picture on how the broken symmetry phase develops at the femto- to picosecond timescale in a low dimensional charge density wave system.

*Gordon and Betty Moore Foundation; U.S. Department of Energy; The MIT Skoltech Program

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Presenters

  • Alfred Zong

    • Physics, MIT
    • Massachusetts Institute of Technology

Authors

  • Alfred Zong

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Anshul Kogar

    • Massachusetts Institute of Technology

  • Timm Rohwer

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Changmin Lee

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Edoardo Baldini

    • Physics, MIT
    • Massachusetts Institute of Technology

  • Emre Ergecen

    • Massachusetts Institute of Technology

  • Mehmet Yilmaz

    • Massachusetts Institute of Technology

  • Ya-Qing Bie

    • Massachusetts Inst of Tech-MIT
    • Massachusetts Institute of Technology

  • Joshua Straquadine

    • Applied Physics, Stanford University
    • Stanford University

  • Byron Freelon

    • Massachusetts Institute of Technology

  • Edbert Jarvis Sie

    • Stanford University
    • Materials Science and Engineering, Stanford University
    • Massachusetts Institute of Technology
    • Stanford Univ

  • Hengyun Zhou

    • Massachusetts Institute of Technology
    • MIT
    • California Institute of Technology

  • Boris Fine

    • Skolkovo Institute of Science and Technology

  • Pablo Jarillo-Herrero

    • Massachusetts Inst of Tech-MIT
    • Department of Physics, Massachusetts Institute of Technology
    • Physics, MIT
    • MIT
    • Massachusetts Institute of Technology

  • Ian Fisher

    • Stanford University
    • Applied Physics, Stanford University
    • Stanford Univ

  • Nuh Gedik

    • Physics, MIT
    • Massachusetts Institute of Technology
    • Massachusetts Inst of Tech-MIT
    • Physics, Massachusetts Institute of Technology