Terahertz Quasiparticle Dynamics and Control in Ca<sub>3</sub>Ru<sub>2</sub>O<sub>7</sub>

ORAL

Abstract

We have investigated the terahertz electrodynamics of single crystals of the Ruddlesden-Popper ruthenate Ca3Ru2O7 using optical-pump terahertz-probe spectroscopy. This correlated semimetal orders antiferromagnetically at TN= 56 K, with the opening of a pseudogap (~2 THz) at TC = 48 K. We predict that Ca3Ru2O7 exhibits novel non-equilibrium states, with the possibility that excitation of c-axis apical oxygen phonons could result in novel phases absent from the equilibrium phase diagram. In the present study, we have investigated near-IR changes in the THz reflectivity following near-infrared excitation. We observe clear signatures of pseudogap dynamics in the spectrally resolved dynamics. In this presentation, we will present a detailed account of these dynamics along with an update of the phonon driven electrodynamic response.

*Work supported by the US Deparment of Energy (U.S. DOE), Office of Basic Energy Sciences (BES) under Grant No. DE-SC00012375.

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Presenters

  • Kelson Kaj

    • Physics, University of California, San Diego
    • University of California, San Diego

Authors

  • Kelson Kaj

    • Physics, University of California, San Diego
    • University of California, San Diego

  • Kevin A Cremin

    • Physics, University of California, San Diego

  • Yu Wang

    • Physics, Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Physics, Penn State University
    • Pennsylvania state University

  • Ian Hammock

    • Physics, University of California, San Diego
    • University of California, San Diego

  • Mustafa Ali

    • Physics, University of California, San Diego

  • Rubaiat Haque

    • Physics, University of California, San Diego

  • Gufeng Zhang

    • Physics, University of California, San Diego

  • Peter Kissin

    • Physics, University of California, San Diego
    • University of California, San Diego

  • Yakun Yuan

    • University of California, Los Angeles
    • Materials Science and Engineering, Pennsylvania State University
    • Pennsylvania State University

  • Danilo Puggioni

    • Department of Materials Science and Engineering, Northwestern University
    • Materials Science and Engineering, Northwestern University
    • Northwestern University

  • Venkatraman Gopalan

    • Materials Science and Engineering, Pennsylvania State University
    • Pennsylvania State University
    • Materials Science and Engineering, Penn State University

  • Zhiqiang Mao

    • Pennsylvania State University
    • Tulane University
    • Physics, Pennsylvania State University
    • Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
    • Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University
    • Penn State University
    • Physics, Penn State University
    • The Pennsylvania State University

  • James Rondinelli

    • Northwestern University
    • Department of Materials Science and Engineering, Northwestern University
    • Materials Science and Engineering, Northwestern University
    • Deparment of Materials Science and Engineering, Northwestern University

  • Richard Averitt

    • Physics, University of California, San Diego
    • Physics, University Of California, San Diego
    • University of California, San Diego