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Plasmon-Exciton Strong Coupling in Single-Molecule Junction Electroluminescence.

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Single molecule junctions emit light via electroluminescence. Strong light-matter coupling leads to Rabi splitting in the emission spectrum, demonstrating a novel single-molecule light emitter.

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Area of Science:

  • Molecular electronics
  • Quantum optics
  • Nanophotonics

Background:

  • Single molecules in metal-molecule-metal junctions can exhibit electroluminescence.
  • Light emission typically arises from molecular state transitions, but can involve hybrid light-matter states under strong coupling.
  • Understanding strong light-matter interactions in molecular junctions is crucial for novel optoelectronic devices.

Purpose of the Study:

  • To investigate electroluminescence in single metal-molecule-metal junctions.
  • To explore the role of light-matter coupling in single-molecule light emission.
  • To demonstrate strong coupling effects in molecular junctions using simultaneous conductance and electroluminescence measurements.

Main Methods:

  • Fabrication of single metal-molecule-metal junctions.
  • Simultaneous measurement of electrical conductance and electroluminescence using a scanning tunneling microscope (STM) with a custom spectrometer.
  • Experimental analysis combined with electronic structure calculations.

Main Results:

  • Evidence for a molecule-electrode interfacial exciton coupled to a junction cavity plasmon was found.
  • At resonant transport conditions, the molecular junction acted as a single emitter strongly coupled to the cavity mode.
  • Characteristic Rabi splitting of the emission spectrum was observed, indicating strong light-matter coupling.

Conclusions:

  • Single-molecule junctions can exhibit strong light-matter coupling.
  • The observed Rabi splitting provides the first example of an electroluminescence-driven single-molecule system in the strong coupling regime.
  • This work opens new avenues for single-molecule optoelectronics and quantum information processing.