TR-ARPES investigation of excitonic properties in the group VII TMD ReSe<sub>2</sub>

ORAL

Abstract

The rhenium dichalcogenides ReS2 and ReSe2 are van der Waals semiconductors with bandgaps in the visible or near-infrared that exhibit strong optical and conductance anisotropy due to their low-symmetry triclinic crystal structure. Together with their notable stability under ambient conditions, this rare combination of properties make them ideal candidates for polarization-sensitive optoelectronic applications.



Strong Coulomb interactions in these materials result in the spectra of low-lying electronic excitations in these materials being dominated by excitonic resonances. Although these transitions have been well studied through optical absorption and photoluminescence spectroscopy, certain key properties such as the location and extent of delocalization of the exciton in momentum-space remain challenging to access without momentum-resolved spectroscopy.



Here, we report a direct time, momentum, and energy resolved measurement of excitonic properties in ReSe2 using time- and angle-resolved photoemission spectroscopy (TR-ARPES).

*The authors would like to acknowledge funding from the Canada First Excellence Research Fund, the Gordon and Betty Moore Foundation's EPiQS Initiative, the Natural Sciences and Engineering Research Council of Canada (NSERC), and the Canada Foundation for Innovation (CFI).

–

Presenters

  • Bradley G Guislain

    • University of British Columbia

Authors

  • Bradley G Guislain

    • University of British Columbia

  • Rysa Greenwood

    • University of British Columbia
    • The University of British Columbia

  • Matteo Michiardi

    • University of British Columbia

  • Sergey Zhdanovich

    • University of British Columbia

  • MengXing Na

    • University of British Columbia

  • Sydney K Dufresne

    • University of British Columbia

  • Arthur K Mills

    • University of British Columbia
    • The University of British Columbia

  • Jerry I Dadap

    • University of British Columbia
    • The University of British Columbia

  • Andrea Damascelli

    • University of British Columbia

  • Ziliang Ye

    • University of British Columbia

  • David Jones

    • University of British Columbia
    • The University of British Columbia