Superconducting Higgs mode in cuprate thin films

ORAL

Abstract

Cuprate high-Tc superconductor hosts multiple competing orders such as the pseudogap, incommensurate magnetism, charge order, etc. These diverse phases were discovered via spectroscopy tools that probe the charge-/spin-excitations of an ordered state. Yet, despite the immense knowledge about cuprates learnt from these experiments, a coherent understanding of the microscopic mechanism behind high-Tc superconductivity is still lacking. A potential answer to this question may come from investigating the collective excitation of the superconducting order parameter itself, which is charge- and spin-neutral and difficult to access by conventional techniques. We accomplish this goal by using an undulator-based high-field THz pulse, which nonlinearly couples to the superconducting condensate and leads to characteristic third harmonic generation. Using this technique, we unveil the collective amplitude oscillation of the superconducting order parameter, the superconducting Higgs mode, in three archetypal families of cuprates for the first time. In addition, we show evidence for a hitherto unreported collective mode universally exhibited by optimally doped samples. A finite Higgs-like response above Tc is also observed in our experiment, suggesting a finite pairing amplitude above Tc.

–

Presenters

  • Hao Chu

    • Max Planck Institute for Solid State Research

Authors

  • Hao Chu

    • Max Planck Institute for Solid State Research

  • Min-Jae Kim

    • Max Planck Institute for Solid State Research

  • Kota Katsumi

    • Department of Physics, University of Tokyo

  • Sergey Kovalev

    • Helmholtz Centre Dresden-Rossendorf

  • Robert Dawson

    • Max Planck Institute for Solid State Research

  • Lukas Schwarz

    • Max Planck Institute for Solid State Research

  • Naotaka Yoshikawa

    • Department of Physics, University of Tokyo
    • Department of Physics, The University of Tokyo

  • Gideok Kim

    • Max Planck Institute for Solid State Research

  • Semyon Germanskiy

    • Helmholtz Centre Dresden-Rossendorf

  • Jan-Christoph Deinert

    • Helmholtz Centre Dresden-Rossendorf

  • Nilesh Awari

    • Helmholtz Centre Dresden-Rossendorf

  • Bertram W Green

    • Helmholtz Centre Dresden-Rossendorf

  • Min Chen

    • Helmholtz Centre Dresden-Rossendorf

  • Mohammed Bawatna

    • Helmholtz Centre Dresden-Rossendorf

  • Georg Cristiani

    • Max Planck Institute for Solid State Research

  • Gennady Logvenov

    • Max Planck Institute for Solid State Research

  • Yann Gallais

    • Laboratoire Matériaux et Phénomenes Quantiques, Université Paris Diderot
    • Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot

  • Alexander Boris

    • Max Planck Institute for Solid State Research
    • Max Planck Institute Stuttgart

  • Bernhard Keimer

    • max planck inst.
    • Max Planck Institute for Solid State Research
    • max planck institut
    • Max-Planck-Institut
    • Max Planck Institute for Solid State Research, Stuttgart, Germany
    • Max Planck Institute Stuttgart

  • Andreas P Schnyder

    • Max Planck Institute for Solid State Research
    • Max-Planck-Institute for Solid State Research, Stuttgart, Germany

  • Dirk Manske

    • Max Planck Institute for Solid State Research

  • Michael Gensch

    • Helmholtz Centre Dresden-Rossendorf

  • Zhe Wang

    • Helmholtz Centre Dresden-Rossendorf

  • Ryo Shimano

    • Cryogenic Research Center and Department of Physics, The University of Tokyo
    • Department of Physics, University of Tokyo

  • Stefan Kaiser

    • Max Planck Institute for Solid State Research