Related Experiment Video
Updated: Jul 17, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
Multiple van Hove Singularities and Layer-Selective Magnetization Switching in the AA-Stacked VSiN3 Bilayer
Ming-Yang Liu1, Fei-Yi Liu1, Hong-Bin Yang1
1School of Physics, Electrical and Energy Engineering, Chuxiong Normal College, Chuxiong675000, P. R. China.
AA-stacked VSiN3 bilayer exhibits tunable magnetic and valley properties due to van Hove singularities. Carrier doping induces switchable magnetization and valley polarization, offering new avenues for spintronics and valleytronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Van Hove singularities (VHSs) in 2D materials are key to emergent electronic and magnetic phases.
- Understanding the interplay of multiple degrees of freedom is crucial for novel material functionalities.
Purpose of the Study:
- Investigate AA-stacked VSiN3 bilayer as a platform for exploring VHS physics.
- Explore tunable electronic, magnetic, and valleytronic properties.
Main Methods:
- First-principles calculations were employed.
- Analysis of electronic structure, charge transfer, and carrier doping effects.
- Investigation of strain and electric field tunability.
Main Results:
- AA-stacked VSiN3 bilayer shows intrinsic out-of-plane polarization tunable by strain and electric fields.
- Layer-dependent van Hove singularities (VHSs) observed at conduction band bottom (CBB) and valence band top (VBT).
- Doping-induced Stoner-type magnetic transition with doping-switchable, layer-selective spin polarization and valley polarization reversal.
Conclusions:
- A novel mechanism for doping-switchable magnetization and valley polarization in a nonmagnetic material is revealed.
- AA-stacked VSiN3 bilayer is a promising candidate for exploring coupled charge, spin, valley, and layer physics.
- Tunable valleytronic behavior remains robust under biaxial strain.
More Related Videos
09:49In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Related Concept Videos
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
Atomic Nuclei: Magnetic Resonance
Atomic Nuclei: Nuclear Spin State Overview
Colors and Magnetism
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.
Magnetic Susceptibility and Permeability
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
¹H NMR Signal Multiplicity: Splitting Patterns