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Updated: Sep 13, 2025

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
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Light emission from a hybrid plasmonic-excitonic STM tunneling junction
Optics Express
|July 30, 2025
Summary
This study explores light emission in a Scanning Tunneling Microscopy (STM) nanojunction. It reveals hybrid plasmonic-excitonic light emission from transition metal dichalcogenide quantum wells, dependent on tunneling parameters.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanophotonics
Background:
- Scanning Tunneling Microscopy (STM) enables atomic-scale surface analysis.
- Transition metal dichalcogenides (TMDs) exhibit unique quantum optical properties.
- Plasmonics and excitons are key light-matter interaction phenomena at the nanoscale.
Purpose of the Study:
- To investigate light emission from a hybrid plasmonic-excitonic system in an STM nanojunction.
- To model the complex interplay between electron tunneling, plasmons, and excitons.
- To understand the factors influencing light emission spectra and quantum efficiency.
Main Methods:
- Utilizing a Scanning Tunneling Microscopy (STM) setup.
- Fabricating a nanojunction with a single monolayer TMD quantum well on a gold surface.
- Modeling inelastic electron tunneling and subsequent radiative emission.
Main Results:
- Observed complex light emission spectra with both plasmonic and excitonic features.
- Demonstrated that emission characteristics depend on tunneling parameters and surface roughness.
- Developed a model that accurately describes experimental observations.
Conclusions:
- Light emission in this STM nanojunction arises from a hybrid plasmonic-excitonic mechanism.
- The quantum efficiency of photon emission is linked to electron tunneling.
- This work provides fundamental insights into nanoscale light generation in hybrid systems.
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