Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.13: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Theory of coherent energy transfer between molecular exciton and gap plasmon induced by a scanning tunneling microscope — Lei-Lei Nian and •Jing-Tao Lü — School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, 430074 Wuhan, P. R. China

The coupling between molecular exciton and gap plasmons plays a key role in single molecular electroluminescence induced by a scanning tunneling microscope(STM). But it has been difficult to clarify the complex experimental phenomena. By employing the nonequilibrium Green’s function technique, we propose a general theoretical approach to understand the light emission from single molecule and gap plasmons near a metal surface excited by the tunneling current. It is shown that the coherent energy transfer between the gap plasmon and molecular exciton leads to a significant Fano resonance when the molecule is located in the proximity of the STM tip. Different line shapes have been observed in recent experiemnts. Being applied to these experiments, our theory can provide a consistent and quantitative account of the experimental results from an energy transport point of view. This theoretical approach allows one to explain and predict the complex energy transfer processes, such as field-matter interaction and quantum interference, important for the further development in this field.