Ultrafast control of antiferromagnetism in a Mott insulator by photo-doping

ORAL

Abstract

Ultrafast photo-doping provides a possible route to control antiferromagnetic order in Mott-Hubbard insulators out-of-equilibrium [1]. However, AFM order is notoriously challenging to probe by optical techniques [2]. Here, we demonstrate time-resolved nonlinear optical rotational anisotropy as a method to detect ultrafast transient changes of magnetic symmetry group. We leverage this technique to uncover the mechanisms by which photo-carriers suppress long range AFM order in the Mott insulator Sr2IrO4 and by which the AFM order is temporally restored.
[1] M. Eckstein and P. Werner, Sci. Rep. 6, 1 (2016).
[2] P. Němec, M. Fiebig, T. Kampfrath, and A. V. Kimel, Nat. Phys. 14, 229 (2018).

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Presenters

  • Alberto De la Torre

    • Department of Quantum Matter Physics, University of Geneva
    • Department of Physics, California Institute of Technology
    • Caltech

Authors

  • Alberto De la Torre

    • Department of Quantum Matter Physics, University of Geneva
    • Department of Physics, California Institute of Technology
    • Caltech

  • Gufeng Zhang

    • University of California, San Diego

  • Michael Buchhold

    • Caltech
    • Department of Physics and Institute for Quantum Information and Matter, California Institute of Technology

  • Yuval Baum

    • Caltech

  • Nicholas Laurita

    • Johns Hopkins University
    • Institute for Quantum Information and Matter, California Institute of Technology
    • Caltech
    • Department of Physics, California Institute of Technology

  • John W Harter

    • University of California, Santa Barbara

  • Liuyan Zhao

    • Department of Physics, University of Michigan
    • University of Michigan
    • University of Michigan, Ann Arbor

  • Xiang Chen

    • UC Santa Barbara
    • University of California, Santa Barbara

  • Richard Douglas Averitt

    • UC San Diego
    • University of California, San Diego
    • Department of Physics, University of California San Diego
    • Univ of California - San Diego

  • Stephen Wilson

    • University of California, Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials, University of California Santa Barbara
    • Materials, University of California, Santa Barbara
    • UC Santa Barbara

  • Gang Cao

    • Department of Physics, University of Colorado-Boulder
    • Department of Physics, University of Colorado, Boulder CO 80309
    • Department of Physics, University of Colorado, Boulder, CO 80309
    • Department of Physics, University of Colorado at Boulder
    • Physics and Astronomy, University of Kentucky
    • University of Colorado, Boulder
    • University of Colorado Boulder

  • Gil Refael

    • California Institute of Technology
    • Caltech
    • Institute for Quantum Information and Matter, Caltech
    • Department of Physics and Institute for Quantum Information and Matter, California Institute of Technology

  • David Hsieh

    • California Institute of Technology
    • Institute for Quantum Information and Matter, California Institute of Technology
    • Caltech
    • Caltech, Physics, Math & Astronomy
    • Physics, California Institute of Technology
    • Department of Physics, California Institute of Technology