Ultrafast electronic dynamics in a strongly correlated insulator SmB$_{6}$

ORAL

Abstract

SmB$_{6}$ is a strongly correlated Kondo insulator that forms a gap at the Fermi level due to hybridization between Sm 4f and 5d states. Such a gap can support interaction-driven excitons protected by strongly renormalized bands as discussed in inelastic neutron scattering and Raman spectroscopy studies. We excite SmB$_{6}$ with an ultrafast laser pulse, and study the resulting dynamics using time- and angle-resolved photoemission spectroscopy. We discover a coherent oscillatory response of the electronic states near the Gamma point, which we characterize as function of excitation density and temperature. We discuss possible origins for the observed mode.

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Presenters

  • Kejun Xu

    Stanford University and SLAC National Accelerator Laboratory, Stanford University, Applied Physics, Stanford University

Authors

  • Kejun Xu

    Stanford University and SLAC National Accelerator Laboratory, Stanford University, Applied Physics, Stanford University

  • Alexandre Gauthier

    Stanford University and SLAC National Accelerator Laboratory, Stanford University

  • Heike Pfau

    Stanford University and SLAC National Accelerator Laboratory

  • Jonathan Sobota

    Stanford University and SLAC National Accelerator Laboratory, Stanford University, Stanford Univ

  • Jing Xia

    Physics and Astronomy, Univ of California - Irvine, Department of Physics and Astronomy, Univ of California - Irvine, University of California Irvine, Department of Physics, University of California, Irvine, Department of Physics and Astronomy, University of California, Irvine

  • Patrick Kirchmann

    SLAC National Accelerator Laboratory, Stanford University

  • Zhi-Xun Shen

    Stanford University, SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, Stanford Univ, SIMIS, Stanford University, Applied Physics, Stanford Univ, Stanford University and SLAC National Accelerator Laboratory, Applied Physics, Stanford University