Time- and angle-resolved photoemission spectroscopy of the intrinsic antiferromagnetic topological insulator EuSn<sub>2</sub>P<sub>2</sub>

ORAL

Abstract

EuSn2P2 was recently predicted to be an antiferromagnetic topological insulator below TN = 30 K. This makes it an ideal candidate to explore the interplay between magnetism and topology including axion electrodynamics. Here we use time- and angle- resolved photoemission spectroscopy (tr-ARPES) to observe and characterize the Dirac surface states of EuSn2P2 both above and below TN. An IR pump pulse populates the previously unoccupied surface states near the Dirac point and a time delayed probe pulse measures the transient ARPES spectra. We will discuss changes in the tr-ARPES decay dynamics across the magnetic transition and further understand the topological nature of the bands using circular dichroism ARPES.

*This work is supported by the Illinois Materials Research Science and Engineering Centers (MRSEC) award number DMR-1720633 and through the Illinois Materials Research Lab (MRL) facilities.

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Presenters

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign

Authors

  • Nina Bielinski

    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign

  • Soyeun Kim

    • University of Illinois at Urbana-Champaign

  • Mebatsion Gebre

    • University of Illinois at Urbana-Champaign

  • Daniel Shoemaker

    • University of Illinois at Urbana-Champaign
    • Materials Research Laboratory, University of Illinois at Urbana-Champaign

  • Fahad Mahmood

    • University of Illinois at Urbana-Champaign
    • Department of Physics, University of Illinois at Urbana-Champaign
    • Material Science and Engineering, University of Illinois at Urbana-Champaign
    • Physics, University of Illinois at Urbana-Champaign