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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.

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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