Probing Cuprate Superconductivity with Nonlinear THz Spectroscopy

ORAL

Abstract

Nonlinear THz spectroscopy provides a new window into the low-energy electrodynamics of complex materials. In superconductors, it allows for the measurement of higher-order correlation functions that are not accessible through linear probes.

In high-Tc cuprate superconductors, the odd-order nonlinear optical susceptibilities are especially pronounced along the c-axis, where Josephson tunneling dominates the response [1]. In this talk, I will present our recent angle-resolved two-dimensional THz spectroscopy (2DTS) experiment on optimally doped La₂₋ₓSrₓCuO₄. I will discuss how these measurements enable an assessment of finite momentum fluctuations of the superconducting order parameter [2].

[1] Laplace, Y., & Cavalleri, A. (2016). Josephson plasmonics in layered superconductors. Advances in Physics: X, 1(3), 387–411

[2] Gómez Salvador, A., et al. (2024). Principles of two-dimensional terahertz spectroscopy of collective excitations: The case of Josephson plasmons in layered superconductors. Phys. Rev. B, 110(9), 094514

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Publication: 1) Liu, A., Pavićević, D., Michael, M.H. et al. Probing inhomogeneous cuprate superconductivity by terahertz Josephson echo spectroscopy. Nat. Phys. (2024). https://doi.org/10.1038/s41567-024-02643-5
2) Gómez Salvador, A., Dolgirev, P. E., Michael, M. H., Liu, A., Pavicevic, D., Fechner, M., Cavalleri, A., & Demler, E. (2024). Principles of two-dimensional terahertz spectroscopy of collective excitations: The case of Josephson plasmons in layered superconductors. Phys. Rev. B, 110(9), 094514. https://doi.org/10.1103/PhysRevB.110.094514

Presenters

  • Danica Pavicevic

    • Max Planck Hamburg
    • Max Planck Institute for Structure and Dynamics of Matter
    • Max Planck Institute for the Structure and Dynamics of Matter

Authors

  • Danica Pavicevic

    • Max Planck Hamburg
    • Max Planck Institute for Structure and Dynamics of Matter
    • Max Planck Institute for the Structure and Dynamics of Matter

  • Albert Liu

    • Brookhaven National Laboratory (BNL)

  • Alex Gomez Salvador

    • ETH Zurich

  • Marios Michael

    • Max Planck Institute for the Structure & Dynamics of Matter
    • Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany

  • Pavel Dolgirev

    • Harvard University

  • Michael Fechner

    • MPSD

  • Ankit S Disa

    • Cornell University

  • Qiang Li

    • Stony Brook University (SUNY)

  • Genda Gu

    • Brookhaven National Laboratory (BNL)

  • Eugene Demler

    • ETH Zurich

  • Pedro M Lozano

    • Argonne National Laboratory
    • Stony Brook University

  • Andrea Cavalleri

    • Max Planck Institute for the Structure & Dynamics of Matter