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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.

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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