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).

–

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