Shuyi Liu, Martin Wolf, and Takashi Kumagai:
Phys. Rev. Lett. 121 (22), 226802 (2018), pp.6;
arXiv:1805.03546 [cond-mat.mes-hall] (2018), pp. 17;
DOI: arXiv:1805.03546 [cond-mat.mes-hall]
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.
The original publication is available by link DOI: 10.1103/PhysRevLett.121.226802