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Journal Article

Plasmon-Assisted Resonant Electron Tunneling in a Scanning Tunneling Microscope Junction

MPS-Authors
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Liu,  Shuyi
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Kumagai,  Takashi
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
JST-PRESTO;

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PhysRevLett.121.226802.pdf
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Citation

Liu, S., Wolf, M., & Kumagai, T. (2018). Plasmon-Assisted Resonant Electron Tunneling in a Scanning Tunneling Microscope Junction. Physical Review Letters, 121(22): 226802. doi:10.1103/PhysRevLett.121.226802.


Cite as: https://hdl.handle.net/21.11116/0000-0002-B2A6-9
Abstract
We report plasmon-assisted resonant electron tunneling from a Ag or Au tip to field emission resonances (FERs) of a Ag(111) surface induced by cw laser excitation of a scanning tunneling microscope (STM) junction at visible wavelengths. As a hallmark of the plasmon-assisted resonant tunneling, we observe a downshift of the first peak in the FER spectra by a fixed amount equal to the incident photon energy. STM-induced luminescence measurement for the Ag and Au tip reveals the clear correlation between the laser-induced change in the FER spectra and the plasmonic properties of the junction. Our results clarify a novel resonant electron transfer mechanism in a plasmonic nanocavity.