Related Experiment Video
Updated: Aug 5, 2026
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Exciton Selectively Coupled to Magnon Dependent on Spin-Lattice Alignment
Chaocheng Liu1, Qi Jiang2, Jiyu Hu3
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei230026, China.
Journal of the American Chemical Society
|July 27, 2026
Summary
This study demonstrates magnon-exciton coupling in van der Waals heterostructures. Excitons selectively interact with Néel-type antiferromagnets, enhancing exciton energy and enabling new opto-spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Optics
Background:
- Excitons, electron-hole pairs, are typically modulated by magnetism via heterostructures.
- Antiferromagnets (AFMs) offer advantages like low stray fields but lack net magnetization for modulation.
- Manipulating excitons using AFM magnons is a significant challenge in spintronics.
Purpose of the Study:
- To investigate and demonstrate magnon-exciton coupling (MEC) in van der Waals heterostructures.
- To reveal the specific dependence of exciton emission on antiferromagnetic spin order.
- To explore new avenues for controlling elementary excitations and developing AFM-based opto-spintronics.
Main Methods:
- Fabrication of van der Waals heterostructures integrating semiconductors and antiferromagnets.
- Experimental investigation of magnon-exciton coupling (MEC).
- Analysis of exciton emission modulation in response to AFM spin configurations.
Main Results:
- Successful demonstration of MEC in vdW heterostructures.
- Selective coupling observed between excitons and Néel-type antiferromagnets.
- Significant increase in exciton energy attributed to spin-lattice-aligned channels and valence band splitting.
Conclusions:
- Interlayer MEC is critically dependent on the antiferromagnetic spin configuration.
- Spin-lattice-aligned channels facilitate magnon-exciton interaction via hopping electrons.
- Provides a novel approach for modulating elementary excitations and advancing AFM-based opto-spintronics.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
01:08NMR Spectroscopy: Spin–Spin Coupling
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
01:23Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...
01:05Atomic Nuclei: Magnetic Resonance
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:08Spin–Spin Coupling Constant: Overview
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...