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Updated: Feb 11, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
Spin-exciton coupling modified by interfacial magnetic interactions in a van der Waals heterostructure
Weican Lan1, Chaocheng Liu2, Yajuan Feng1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, China.
Researchers modulated exciton energy in 2D antiferromagnetic semiconductors using a heterostructure. This breakthrough allows bidirectional control, enhancing device design flexibility for quantum information and optoelectronics.
Area of Science:
- Solid-state physics
- Materials science
- Quantum optics
Background:
- Excitons are key elementary excitations in solids with applications in photospintronics and quantum transduction.
- Two-dimensional (2D) antiferromagnetic semiconductors offer potential for spin-exciton interactions and multifield control.
- Manipulating excitonic quantum states in these materials while retaining antiferromagnetic properties is challenging.
Purpose of the Study:
- To achieve bidirectional modulation of exciton energy in 2D antiferromagnetic semiconductors.
- To explore interfacial interactions for controlling spin-exciton coupling.
- To demonstrate a method for wavelength control in quantum information and optoelectronic devices.
Main Methods:
- Fabrication of a CrSBr/Fe3GaTe2 heterostructure.
- Analysis of photoluminescence (PL) spectra to observe exciton energy shifts.
- Investigation of interfacial charge-transfer-driven magnetic coupling and its effect on magnetic anisotropy and exchange interaction.
Main Results:
- Bidirectional modulation of CrSBr exciton energy was achieved via interfacial interaction.
- Photoluminescence peaks showed blueshift (6.1%) and redshift (8.6%) compared to pristine CrSBr.
- Interfacial coupling enhanced magnetic anisotropy and exchange interaction, stabilizing antiferromagnetism and suppressing recombination, leading to exciton emission blueshift.
Conclusions:
- Demonstrated a novel approach for bidirectional exciton energy modulation in 2D antiferromagnetic semiconductors.
- Interfacial engineering provides flexibility for device design and potential wavelength control.
- Findings pave the way for advanced quantum information processing and optoelectronic technologies.
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