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Terahertz investigation of strong coupling between metamaterials and superconducting Josephson plasmons in La<sub>2-x</sub>Sr<sub>x</sub>CuO<sub>4</sub>

ORAL

Abstract

We investigate the coupling between an array of metamaterial resonators and the Josephson Plasma Resonance (JPR) in superconducting La2-xSrxCuO4 (LSCO) using terahertz (THz) time domain spectroscopy. This is accomplished by adhering metamaterial “tapes” to the surface of an LSCO single crystal with the c-axis in-plane. We are able to repeatably bring the resonators within ~1um of the LSCO surface. The resulting electrodynamic response is measured as a function of temperature and resonator-surface distance, essentially changing the coupling strength. In the superconducting state, coupling between the metamaterial mode and the JPR renormalizes the JPR frequency, suggestive of a large modification of the superconducting state. The nonlinear response, measured with THz fields up to approximately 100kV/cm is consistent with strong-coupling induced modification of superconductivity as such measurements also exhibit plasma edge renormalization with increasing field strength.

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Presenters

  • Kelson Kaj

    University of California San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California, San Diego

Authors

  • Kelson Kaj

    University of California San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California, San Diego

  • Ian Newton Hammock

    University of California, San Diego

  • Chunxu Chen

    Boston University, Mechanical Engineering, Boston University

  • Xiaoguang Zhao

    Boston University, Mechanical Engineering, Boston University

  • Kevin A Cremin

    Department of Physics, University of California, San Diego, University of California, San Diego

  • Michael Fogler

    University of California, San Diego, Department of Physics, University of California San Diego, UC San Diego, Department of Physics, University of California, San Diego, UCSD, University of California San Diego

  • Dmitri Basov

    Columbia University, Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ

  • Xin Zhang

    Boston University, Mechanical Engineering, Boston University

  • Richard Averitt

    University of California, San Diego, University of California San Diego, UC San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California