Theory and First-Principle Calculation of Photoemission Spectra from Optically Excited States

ORAL

Abstract

The behaviors of optically excited states, such as excitons, not only give rise to a variety of fascinating phenomena in condensed matter, but also play vital roles in modern optoelectronics and energy harvesting. In this talk, I will present our recent development on the theory and first-principle methods in the study of the photoemission spectra of low-dimensional materials. By performing calculations based on many-body perturbation theories, we show that, in monolayer transition metal dichalcogenides, the excitons hold unique energy dispersions and spectra weights in photoemission, which unveil the fundamental physical properties of these excited states. We further connect our theoretical works to experimental results and explore their potential applications in other systems.

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Presenters

  • Ting Cao

    • University of Washington
    • Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Physics, University of Washington
    • Department of Materials Science and Engineering, University of Washington and Geballe Laboratory for Advanced Materials, Stanford University

Authors

  • Ting Cao

    • University of Washington
    • Department of Physics, University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Physics, University of Washington
    • Department of Materials Science and Engineering, University of Washington and Geballe Laboratory for Advanced Materials, Stanford University

  • Keshav M Dani

    • Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University

  • Tony F Heinz

    • Stanford Univ
    • Applied Physics and Photon Science, Stanford University
    • Department of Applied Physics, Stanford University and SLAC National Accelerator Laboratory