Nonequilibrium Green's Function Theory of Scanning Tunneling Microscope-Induced Light Emission from Molecule Covered Metal Surfaces: Effects of Coupling between Exciton and Plasmon Modes

DOI Web Site 参考文献17件
  • Miwa Kuniyuki
    Surface and Interface Science Laboratory, RIKEN
  • Imada Hiroshi
    Surface and Interface Science Laboratory, RIKEN
  • Sakaue Mamoru
    Center for International Affairs, Graduate School of Engineering, Osaka University
  • Kasai Hideaki
    Department of Applied Physics, Osaka University Center for Atomic and Molecular Technologies, Osaka University
  • Kim Yousoo
    Surface and Interface Science Laboratory, RIKEN

抄録

Light emission from interface plasmons and molecular excitons induced by the tunneling current of a scanning tunneling microscope is theoretically investigated using the nonequilibrium Green's function method. Luminescence property of the system is found to be well interpreted in terms of superposition of two coupled modes that form due to coupling between a molecular excitonic mode and an interface plasmon mode. The coupled mode whose energy is closer to the energy of the molecular excitonic mode (the interface plasmon mode) leads to a sharp (broad) peak structure in luminescence spectra of interface plasmon. Interference between these coupled modes gives rise to suppression or enhancement of luminescence intensity depending on the energy region. Especially, in the energy region near the molecular excitonic mode, the interference leads to strong suppression of luminescence from interface plasmons. Thus novel aspects of interpretation of the luminescence spectra of the system are obtained by using the analytical approach presented here. [DOI: 10.1380/ejssnt.2015.385]

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