Infrared light emission from atomic point contacts

Abstract

Gold atomic point contacts are prototype systems to evidence ballistic electron transport. The typical dimension of the nanojunction being smaller than the electron-phonon interaction length, even at room temperature, electrons transfer their excess energy to the lattice only far from the contact. At the contact however, favored by huge current densities, electron-electron interactions result in a nano hot electron gas acting as a source of photons. Using a home built Mechanically Controlled Break Junction, it is reported here, for the first time, that this hot electron gas also radiates in the infrared range (0.2eV to 1.2eV). Moreover, in agreement with the pioneering work of Tomchuk, we show that this radiation is compatible with a blackbody like spectrum emitted from an electron gas at temperatures of several thousands of Kelvin given by $(kB.Te{)}^2=\alpha .I.V$ where $\alpha$, $I$ and $V$ are respectively a fitting parameter, the current flowing and the applied bias.

13 pages, 5 figures

References in corpus (6)

• Quantum properties of atomic-sized conductors
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• Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers
• Direct Measurement of Auger Electrons Emitted from a Semiconductor Light-Emitting Diode under Electrical Injection: Identification of the Dominant Mechanism for Efficiency Droop
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Cited by in corpus (5)

• Tuning light emission crossovers in atomic-scale aluminum plasmonic tunnel junctions
• Biased Nanoscale Contact as Active Element for Electrically Driven Plasmonic Nanoantenna
• Estimating single molecule conductance from spontaneous evolution of a molecular contact
• Effect of quantized conductivity on the anomalous photon emission radiated from atomic-size point contacts
• Light Emission and Conductance Fluctuations in Electrically Driven and Plasmonically Enhanced Molecular Junctions