Terahertz Higgs Echo Spectroscopy of a Niobium Superconductor

ORAL

Abstract

THz multi-dimensional coherent spectroscopy (MDCS) has been proven to be a powerful tool to study driven quantum systems and discover collective modes in superconductors. Here, we report the observation of robust Higgs echoes in a Niobium superconductor through phase-locked pulse-pair coherent driving using THz-MDCS. The nonlinear quantum excitation pathway of the echo signals demonstrates an unambiguous origin from Higgs mode excitation and separate the Higgs peaks from quasi-particle (QP) ones. We also reveal Higgs-Higgs interactions from the correlative modulation of the superconductor order parameter . Our quantum kinetic simulations capture the spectral-temporal features from experiment results and unravel the role of Higgs-Higgs interactions in the formation of echoes. Our discovery provides a deep insight into the exotic coherence and correlation from superconducting amplitude channels, bringing a new view of manipulating the correlated quantum systems.

*This work was supported by the Ames National Laboratory, the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division under contract No. DEAC0207CH11358.

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Presenters

  • Chuankun Huang

    • Iowa State University

Authors

  • Chuankun Huang

    • Iowa State University

  • Martin Mootz

    • Iowa State University
    • Ames National Laboratory

  • Liang Luo

    • Ames National Laboratory
    • Ames Laboratory

  • Yihua Qiang

    • Iowa State University
    • Ames National Laboratory / Iowa State University

  • Victor Quito

    • Iowa State University

  • Peter P Orth

    • Ames National Laboratory and Iowa State University
    • Iowa State University
    • Ames National Laboratory / Iowa State University

  • Ilias Perakis

    • University of Alabama at Birmingham

  • JIGANG Wang

    • Iowa State University

  • Avinash Khatri

    • Iowa State University