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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

Electrically tunable dipolar interactions between layer-hybridized excitons.

Daniel Erkensten¹, Samuel Brem², Raül Perea-Causín¹

¹Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden. daniel.erkensten@chalmers.se.

|June 13, 2023

Summary

This summary is machine-generated.

We explored hybrid exciton interactions in WSe2 bilayers, finding electric fields tune exciton behavior. Different electric field strengths lead to distinct interaction regimes with unique properties.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Optics

Background:

Transition-metal dichalcogenide (TMD) bilayers host complex exciton states, including layer-hybridized excitons with both intra- and interlayer character.
These hybrid excitons are crucial for understanding light-matter interactions in 2D materials.

Purpose of the Study:

To investigate hybrid exciton-exciton interactions in naturally stacked WSe2 homobilayers.
To understand the electrical tunability of exciton properties and interactions in these systems.

Main Methods:

Utilized a microscopic, material-specific many-particle theory.
Analyzed interactions under varying external electric fields to identify different regimes.

Main Results:

Identified two distinct interaction regimes: low-dipole (small fields) and high-dipole (large fields).
Low-dipole regime shows weak interactions between intralayer-like excitons.
High-dipole regime features strong dipole-dipole repulsion between interlayer-like excitons, causing spectral blue-shifts and anomalous diffusion.

Conclusions:

Demonstrated the significant electrical tunability of hybrid exciton-exciton interactions in WSe2 bilayers.
Provided insights into the fundamental physics governing exciton behavior in atomically thin semiconductors.
The findings can guide future experimental research in 2D materials and optoelectronics.