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Valley-Dependent Emission Patterns Enabled by Plasmonic Nanoantennas.

Tobias Bucher^1,2,3, Jingshi Yan⁴, Jan Sperrhake^2,3

¹Institute of Solid-State Physics, Friedrich Schiller University Jena, Jena 07743, Germany.

|March 24, 2026

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This summary is machine-generated.

Researchers demonstrate a direct link between valley polarization and emission patterns in transition metal dichalcogenides. This breakthrough enables precise control for valleytronic devices and quantum information applications.

Area of Science:

Condensed Matter Physics
Materials Science
Quantum Optics

Background:

Controlling emission patterns of valley-polarized excitons in transition metal dichalcogenides is crucial for advanced devices.
Existing methods face challenges in linking routing effects to valley polarization and distinguishing them from optical scattering.

Purpose of the Study:

To experimentally and numerically demonstrate a direct link between excitonic valley polarization and far-field emission patterns.
To enable quantitative evaluation of valley-selective emission routing.
To establish a robust platform for valleytronic signal processing.

Main Methods:

Utilized gold nanobar dimer antennas to manipulate the angular emission pattern of monolayer tungsten diselenide at cryogenic temperatures.

Keywords:

directional emission monolayer TMDs nanoantennas plasmonics valley-momentum coupling valleytronics

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Employed excitation with opposite circularly polarized light to probe valley-selective asymmetry in photoluminescence circular dichroism.

Developed a reciprocity-based numerical framework for modeling valley-selective emission in periodic systems.

Main Results:

Observed a 2% valley-selective asymmetry in photoluminescence circular dichroism, confirming valley-dependent emission manipulation.
Numerical calculations revealed that directionality is a symmetry-protected property of the nanoantenna array.
Demonstrated that emitter distribution can substantially enhance valley-dependent directionality.

Conclusions:

Established a direct correlation between excitonic valley polarization and emission patterns.
Validated a nanoantenna platform for quantitative evaluation and manipulation of valley-selective emission.
Showcased the potential of this platform for robust valleytronic signal processing and advanced optoelectronic devices.