Multiphonon processes and resonant Raman scattering in bilayer MoS2/WS2

ORAL

Abstract

Resonant Raman scattering can be a powerful complement to the commonly used non-resonant, but its utility is limited by the absence of practical calculational schemes of resonant Raman intensities. By combining the Kramers-Heisenberg-Dirac (KHD) formula with the path-integral technique, we express the Resonant Raman intensity as a triple integral in time domain, analytically including all contributions from multiphonon processes. We calculate the resonant Raman intensities of a bilayer MoS2/WS2 vertical heterostructure, which features strong interlayer charge transfer in the excited state. We report multiple resonance peaks in Raman intensity as a function of the laser energy. The results constitute strong evidence of involvement of multiple phonon modes. We also demonstrate that a resonant Raman spectrum can distinguish between different stacking sequences of the bilayer.

*Work supported by NSF grant ECCS-1508898; the M2QM DOE EFRC at UF; EU/FP7-REGPOT-2012-2013-1 and HELLAS-CH at the U of Crete; computations at UF and XSEDE.

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Presenters

  • Yue Yu

    • Department of Physics, Center for Molecular Magnetic Quantum Materials and Quantum Theory Project, University of Florida
    • Department of Physics, University of Florida
    • Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, FL

Authors

  • Yue Yu

    • Department of Physics, Center for Molecular Magnetic Quantum Materials and Quantum Theory Project, University of Florida
    • Department of Physics, University of Florida
    • Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, FL

  • Jun Jiang

    • Department of Physics, University of Florida

  • Liangbo Liang

    • Oak Ridge National Laboratory
    • Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

  • Georgios D Barmparis

    • Department of Physics, University of Crete
    • Department of Physics, University of Crete, Greece

  • Sokrates T Pantelides

    • Department of Physics and Engineering, Vanderbilt University
    • Department of Physics and Astronomy, Vanderbilt Univ
    • Department of Physics and Astronomy, Vanderbilt University
    • Vanderbilt Univ
    • Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
    • Institute of Physics, Chinese Academy of Sciences
    • Department of Physics and Astronomy & Department of Electrical Engineering and Computer Science, Vanderbilt University
    • Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN
    • Department of Electrical Engineering and Computer Science, Vanderbilt University
    • Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science, Vanderbilt University
    • Vanderbilt University

  • Xiaoguang Zhang

    • Department of Physics and the Quantum Theory Project, University of Florida
    • University of Florida
    • Department of Physics, Center for Molecular Magnetic Quantum Materials and Quantum Theory Project, University of Florida
    • Department of Physics, University of Florida
    • Department of Physics and the Quantum Theory Project, University of Florida, Gainesville, FL
    • Physics, University of Florida