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Related Experiment Video

Updated: Jul 1, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation.

Steffi Y Woo¹, Fuhui Shao^1,2,3, Ashish Arora^4,5

¹Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France.

|March 12, 2024

Summary

This summary is machine-generated.

Engineers optical properties of 2D materials like transition metal dichalcogenides (TMDs) using near-field coupling with graphene. This method shapes spectral profiles for advanced nanophotonic devices.

Keywords:

electron energy-loss spectroscopy excitons transition metal dichalcogenides two-dimensional materials van der Waals heterostructure

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

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Published on: September 23, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Precise control over optical properties of 2D materials is crucial for optoelectronics.
Transition metal dichalcogenides (TMDs) are key 2D materials with tunable optical characteristics.

Purpose of the Study:

To engineer the exciton line shape and charge state of 2D materials.
To explore near-field coupling effects between TMDs and graphene/graphite.
To investigate the potential for shaping spectral profiles in nanophotonic devices.

Main Methods:

Fabrication of van der Waals heterostructures involving TMDs (WS2, MoSe2, WSe2) with graphene, graphite, or hexagonal boron nitride (h-BN).
Utilizing near-field coupling to modify optical properties.
Characterization using electron beam and light probes, analyzed via 2D optical conductivities.

Main Results:

Achieved Fano-like asymmetric spectral features in WS2, MoSe2, and WSe2 heterostructures.
Observed suppression of trion emission and a red shift in neutral exciton energy in h-BN encapsulated WSe2/graphene.
Demonstrated that 2D optical conductivities accurately describe system responses.

Conclusions:

Near-field coupling offers a method to control and engineer the optical properties of 2D materials.
This approach enables shaping of spectral profiles for potential applications in nanophotonics.
The study provides fundamental insights into exciton interactions within structured 2D environments.