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Measuring the efficiency of plasmon excitation by tunnelling currents

AuthorsMartín-Jiménez, Alberto; Écija, David; Granados, Daniel ; Gallego, José M. ; Miranda, Rodolfo ; Otero, Roberto
Issue Date2015
Citation31st European Conference on Surface Science (2015)
AbstractThe fact that light is emitted when a current is injected through a tunnel junction was first found in the 70¿s by Lambert and McCarthy [1], and is currently exploited to analyze the light arising from the local junctions created between the tip and the sample in Scanning Tunneling Microscopes (Scanning Tunneling Luminescence, STL) [2]. It was long understood that the origin of the light is the radiative decay of Localized Surface Plamon Resonances (LSPRs) which are excited by electrons tunneling inelastically between the electrodes. However, the relatively large energies of LSPR modes hindered any experiment aimed at measuring the inelastic signal in I(V) curves recorded while tunneling (Scanning Tunneling Spectroscopy, STS). In this contribution we show STS measurements displaying a clear inelastic signal in the same energy range as the light recorded in STL experiments with the same tip. Our experiments allow for a quantification of the plasmon excitation efficiency by tunneling electrons which might become essential to extract information from STL spectra.
DescriptionPaper presented at the 31st European Conference on Surface Science (eccos 31), held in Barcelona (Spain) on August 31st - September 4th, 2015.
Appears in Collections:(ICMM) Comunicaciones congresos
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