Studying ultrafast hot electron dynamics in topological nodal-line semimetal ZrSiS using XUV-based time- and angle-resolved photoemission spectroscopy

ORAL

Abstract

We study the ultrafast hot electron cooling process on topological nodal-line semimetal ZrSiS using an advanced XUV-based time- and angle-resolved photoemission spectroscopy (trARPES) with sub-30 meV energy resolution and 320 fs time resolution. By scanning the delay, the transient ARPES spectra on the nodal-line bulk states and surface states are measured, separately. We find that the relaxation decay of the transient electronic temperature in the nodal-line bulk states (around 700 fs) is longer than the surface states (around 320 fs). More interestingly, the relaxation process of the hot electron temperature in the nodal-line bulk states contains contributions from multiple channels. Our studies reveal the unique ultrafast properties of the hot electrons in the nodal-line semimetal ZrSiS.

*This project is supported by the Air Force Office of Scientific Research under Award numbers FA9550-17-1-0415 and FA9550-16-1-0149.

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Presenters

  • Yangyang Liu

    • Physics, University of Central Florida
    • University of Central Florida
    • Department of Physics, University of Central Florida

Authors

  • Yangyang Liu

    • Physics, University of Central Florida
    • University of Central Florida
    • Department of Physics, University of Central Florida

  • Md Mofazzel Hosen

    • University of Central Florida
    • Physics, Boston College
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Gyanendra Dhakal

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Christopher Sims

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • John E Beetar

    • University of Central Florida

  • Sabin Regmi

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Klauss Dimitri

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Firoza Kabir

    • University of Central Florida
    • Physics, University of Central Florida
    • Department of Physics, University of Central Florida

  • Dariusz Kaczorowski

    • Institute of Low Temperature and Structure Research, Polish Academy of Sciences
    • Institute of Low Temperature and Structure Research
    • Polish Academy of Science

  • Michael Chini

    • University of Central Florida

  • Madhab Neupane

    • University of Central Florida
    • Physics, University of Central Florida
    • Univ of Central Florida
    • Department of Physics, University of Central Florida