Twist angle control of excited states in transition metal dichalcogenide bilayers

 · Invited

Abstract

A new type of superlattice, known as the moiré superlattice, form when two monolayers of van der Waals materials are vertically stacked. A periodic energy modulation, as well as distinct optical selection rules, gives rise to rich optical properties. In this talk, I will discuss how the twist angle controls the exciton resonances, lifetimes, diffusion in transition metal dichalcogenide heterobilayers. It is possible to control the twist angle with a higher degree of accuracy in homobilayers, we show that lattice reconstruction occurs over a rather large range, as manifested in Raman spectra.

*We gratefully acknowledge funding from DoE Basic Energy Science program via grant DESC0019398, NSF MRSEC program DMR-1720595, NSF DMR-1808042, and Welch Foundation F-1662.

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Presenters

  • Xiaoqin (Elaine) Li

    • University of Texas at Austin
    • Physics, University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • U.T. Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin

Authors

  • Xiaoqin (Elaine) Li

    • University of Texas at Austin
    • Physics, University of Texas at Austin
    • Department of Physics, University of Texas at Austin
    • U.T. Austin
    • Department of Physics, The University of Texas at Austin
    • Department of Physics, Center of Complex Quantum Systems, University of Texas at Austin