Related Experiment Video
Updated: Jan 17, 2026
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
11.7K
Magnetic Field Tunable Raman Scattering and Zone-Folding Phonons in Two-Dimensional Magnet CrSBr.
Junyang Chen1, Mingqiang Gu1,2,3, Xiaohua Wu1
1Department of Physics, State Key Laboratory of Quantum Functional Materials, and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology, Shenzhen 518055, China.
ACS Nano
|January 14, 2026
Summary
We found that magnetic order in CrSBr significantly alters Raman scattering. Changes in magnetic state (antiferromagnetic to ferromagnetic) cause abrupt Raman intensity shifts and unique phonon modes, impacting spintronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Low-Dimensional Physics
Background:
- Two-dimensional (2D) magnets are crucial for spintronics and fundamental physics.
- CrSBr is a key van der Waals material exhibiting antiferromagnetic (AFM) and ferromagnetic (FM) properties.
- Strong coupling between electronic structure and magnetism in CrSBr drives research.
Purpose of the Study:
- To investigate the relationship between magnetic order and Raman scattering in CrSBr.
- To understand how magnetic transitions affect phonon modes and optical properties.
- To explore magneto-optical effects in 2D magnetic materials.
Main Methods:
- Raman spectroscopy on bulk and few-layer CrSBr.
- Application of magnetic fields along the easy axis.
- Analysis of Raman intensity, phonon modes, and polarization dependence.
Main Results:
- Abrupt Raman intensity changes observed during AFM-FM transition due to modified exciton detuning.
- Appearance of strong zone-folding phonon modes in the spin-canted state.
- FM order introduces off-diagonal Raman tensor terms, altering polarization patterns.
Conclusions:
- Magnetic order profoundly impacts Raman scattering intensity and phonon activity in CrSBr.
- Magneto-optical effects in 2D magnets are significantly influenced by magnetic states.
- Findings enhance understanding for 2D spintronic device development.
More Related Videos
Related Concept Videos
01:05Atomic Nuclei: Magnetic Resonance
1.1K
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...
1.1K
01:12Two-Dimensional (2D) NMR: Overview
1.5K
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
1.5K
01:14NMR Spectrometers: Resolution and Error Correction
1.0K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
1.0K
01:20Raman Spectroscopy: Overview
1.4K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
1.4K
01:12Double Resonance Techniques: Overview
705
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
705
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.2K
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.
1.2K