Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 40: Transport: Molecular Electronics I (TT jointly with O)

O 40.5: Talk

Wednesday, April 2, 2014, 10:30–10:45, HSZ 304

Theory of molecular junction electroluminescence: plasmon-enhancement and emission narrowing due to multiple molecules — •Yuan Zhang and Volkhard May — Institut für Physik, Humboldt Universität zu Berlin, Newtonstraße 15, D-12489, Germany

Photoemission of a molecular junction formed by up to five individual molecules and placed in the proximity of an Au nanosphere is studied theoretically. Charge transmission through the molecules at a finite applied voltage induces an electronic excitation while an energy transfer coupling to the nanosphere is responsible for plasmon excitation and enhancement effects. The consideration of several molecules and larger currents results in an increased electroluminescence intensity compared to earlier studies [1,2].The used density matrix description accounts for the entanglement of different molecular excitations due to their simultaneous coupling to the Au nanosphere. The obtained emission line narrowring with increasing number of molecules is related to the SPASER mechanism.
Y. Zhang, Y. Zelinskyy, and V. May, J. Chem. C 116, 25962 (2012)
Y. Zhang, Y. Zelinskyy, and V. May, Phys. Rev. B 88, 155426 (2013)