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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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Kapitza-resistance-like exciton dynamics in atomically flat MoSe2-WSe2 lateral heterojunction
Hassan Lamsaadi1, Dorian Beret2, Ioannis Paradisanos2,3
1CEMES-CNRS, Université de Toulouse, Toulouse, France.
Nature Communications
|September 22, 2023
Summary
Researchers developed a new method to control exciton flow in two-dimensional materials. Atomically sharp heterostructures enable unidirectional excitonic transport, crucial for future room-temperature excitonic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Controlling neutral excitonic flux is essential for developing room-temperature two-dimensional excitonic devices.
- Semiconducting Monolayer Transition Metal Dichalcogenides (TMD-ML) offer robust and mobile excitons but face challenges in long-distance controlled transport.
Purpose of the Study:
- To demonstrate a method for achieving unidirectional excitonic flow in TMD-ML lateral heterostructures.
- To introduce and investigate the concept of exciton Kapitza resistance.
Main Methods:
- Fabrication of atomically sharp TMD-ML lateral heterostructures (MoSe2-WSe2).
- Utilized tip-enhanced photoluminescence spectroscopy (TEPL) to analyze exciton behavior.
- Employed a modified exciton transfer model to interpret experimental data.
Main Results:
- Demonstrated transformation of isotropic exciton diffusion into unidirectional flow at the heterostructure junction.
- Observed a discontinuity in exciton density distribution across the interface.
- Introduced and quantified exciton Kapitza resistance at the junction.
Conclusions:
- Atomically sharp TMD-ML heterostructures enable controlled, unidirectional exciton transport.
- Exciton transport properties can be tuned via exciton density, near-field engineering, and laser power.
- This work offers a pathway for designing and fabricating advanced excitonic devices.
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