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Spectroscopic evidence for electron-boson coupling in electron-doped Sr<sub>2</sub>IrO<sub>4</sub>

ORAL

Abstract

The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr2IrO4 is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr2IrO4: electron-boson coupling. A kink in nodal dispersion is observed. The strength of the kink changes with doping, but the energy scale remains the same. These results provide the first non-cuprate platform for exploring the relationship between the pseudogap, d-wave instability and electron-boson coupling in doped Mott insulators.

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Presenters

  • Junfeng He

    University of Science and Technology of China

Authors

  • Yong Hu

    University of Science and Technology of China

  • Xiang Chen

    University of California, Santa Barbara

  • Shuting Peng

    University of Science and Technology of China

  • Christopher Lane

    Northeastern University, Physics, Northeastern University, Los Alamos National Laboratory

  • Matthew Matzelle

    Northeastern University

  • Zeliang Sun

    University of Science and Technology of China

  • Makoto Hashimoto

    SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Stanford Synchrotron Radiation Lightsource, SSRL, SLAC National Laboratory, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Donghui Lu

    SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory

  • Eike F. Schwier

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Masashi Arita

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Tao Wu

    University of Science and Technology of China

  • Robert Markiewicz

    Northeastern University

  • Kenya Shimada

    Hiroshima University, Hiroshima Synchrotron Radiation Center, Hiroshima University

  • Xianhui Chen

    University of Science and Technology of China, Nanjing University, physics department, University of Science and Technology of China

  • Zhixun Shen

    Standford, Stanford University, Stanford Univeristy, Applied Physics, Stanford University, SLAC National Accelerator Laboratory, Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, SIMES, SLAC - Natl Accelerator Lab, Stanford Univ

  • Arun Bansil

    Northeastern University, Physics, Northeastern University

  • Stephen Wilson

    University of California, Santa Barbara, Materials Department, University of California, Santa Barbara, Materials Engineering, University of California, Santa Barbara, California NanoSystems Institute/Materials, University of California, Santa Barbara

  • Junfeng He

    University of Science and Technology of China