期刊
NANO LETTERS
卷 20, 期 12, 页码 8912-8918出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03994
关键词
electroluminescence; tunnel junction; blackbody radiation; surface plasmons; nanophotonics; scanning tunneling microscope break junction
类别
资金
- Center for Precision Assembly of Superstratic and Superatomic Solids at Columbia University, an NSF MRSEC [DMR-1420634]
- NSF [DMR-1807580]
Light emission from tunnel junctions are a potential photon source for nanophotonic applications. Surprisingly, the photons emitted can have energies exceeding the energy supplied to the electrons by the bias. Three mechanisms for generating these so-called overbias photons have been proposed, but the relationship between these mechanisms has not been clarified. In this work, we argue that multielectron processes provide the best framework for understanding overbias light emission in tunnel junctions. Experimentally, we demonstrate for the first time that the superlinear dependence of emission on conductance predicted by this theory is robust to the temperature of the tunnel junction, indicating that tunnel junctions are a promising candidate for electrically driven broadband photon sources.
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