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1 Department of Micro- and Nanotechnology, Technical University of Denmark 2 Theoretical Nanoelectronics, Department of Micro- and Nanotechnology, Technical University of Denmark 3 Christian-Albrechts-Universität zu Kiel 4 Center for Nanostructured Graphene, Center, Technical University of Denmark
The emission of plasmonic light from a single C60 molecule on Cu(111) is probed in a scanning tunneling microscope from the weak-coupling, tunneling range to strong coupling of the molecule to the electrodes at contact. At positive sample voltage the photon yield decreases owing to shot-noise suppression in an increasingly transparent quantum contact. At reversed bias an unexpected nonlinear increase occurs. First-principles transport calculations reveal that ultrafast charge fluctuations on the molecule give rise to additional noise at optical frequencies beyond the shot noise of the current that is injected to the tip. © 2012 American Physical Society.
Physical Review Letters, 2012, Vol 109, Issue 18
Calculations; Shot noise; Molecules
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