Evolution of in-gap spectral weight in electron- and hole-doped Sr<sub>2</sub>IrO<sub>4</sub> studied by time-resolved optical reflectivity

ORAL

Abstract

The 5d transition metal oxide Sr2IrO4 realizes an unusual Jeff = 1/2 antiferromagnetic Mott insulating ground state that is stabilized by an interplay of strong spin-orbit coupling and on-site Coulomb repulsion. Motivated by its structural and magnetic similarities to La2CuO4 - the parent compound of cuprate high-Tc superconductors - there have recently been intensive efforts to study the electron-doped (Sr1-xLax)2IrO4 series and the hole-doped Sr2Ir1-xRhxO4 series. In both cases, light substitution levels trigger a collapse of long-range antiferromagnetic order and an emergence of unusual metallic states with residual pseudogaps. Here we study the doping evolution of the electronic density of states in both (Sr1-xLax)2IrO4 and Sr2Ir1-xRhxO4 using ultrafast time-resolved optical reflectivity. Our results reveal a similar development of in-gap states and a shifting of the chemical potential upon crossing over from Mott insulator to metal on both electron- and hole-doped sides of the phase diagram.

–

Presenters

  • Hao Chu

    • California Institute of Technology

Authors

  • Hao Chu

    • California Institute of Technology

  • Alberto De la Torre

    • University of Geneva
    • California Institute of Technology
    • Department of Physics, California Institute of Technology

  • Liuyan Zhao

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

  • Nakheon Sung

    • Los Alamos National Laboratory

  • B. J. Kim

    • Max Planck Institute for Solid State Research

  • Gang Cao

    • Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado-Boulder
    • Department of Physics, University of Colorado Boulder
    • Materials Science and Engineering Program, University of Colorado Boulder
    • Department of Physics, Univ of Colorado - Boulder
    • Department of Physics, University of Colorado
    • University of Colorado at Boulder

  • Jae-Suk Lee

    • Gwangju Institute of Science and Technology

  • David Hsieh

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