Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Plasmonics & Nanooptics III: STM and Time-Resolved Methods (joint session O/CPP)
O 50.1: Vortrag
Mittwoch, 3. April 2019, 10:30–10:45, H8
Plasmon-assisted resonant electron tunneling in a scanning tunneling microscope junction — Shuyi Liu1, Martin Wolf1, and •Takashi Kumagai1,2 — 1Fritz-Haber Institute of the Max-Planck Society — 2JST-PRESTO
Plasmon-induced phenomena have attracted increasing attention due to diverse applications in nanoscale science and technology [1]. Plasmonic nanocavities play a particularly important role because of their ability to confine light to nanometric volumes and generate a strong field enhancement. We report plasmon-assisted resonant electron tunneling from an 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 [2]. 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. References: [1] M. L. Brongersma, N. J. Halas, P. Nordlander, Plasmon-induced hot carrier science and technology. Nat. Nanotechnol. 10, 25-34 (2015). [2] S. Liu, M. Wolf, T. Kumagai, Phys. Rev. Lett. in print, 10.1103/PhysRevLett.121.226802.