Related Experiment Video
Updated: Jun 4, 2025
10:36
Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
10.5K
Quantum Anomalous Layer Hall Effect in Realistic van der Waals Heterobilayers
Yuping Tian1, Xiangru Kong1, Cui Jiang2
1College of Sciences, Northeastern University, Shenyang 110819, China.
Nano Letters
|December 17, 2024
Summary
We propose the quantum anomalous layer Hall effect (QALHE) in valleytronic materials using van der Waals heterobilayers. Biaxial strain controls dissipationless currents in specific layers, enabling QALHE for spintronics and quantum layertronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- The quantum anomalous Hall effect (QALHE) is crucial for fundamental physics and nanodevices.
- QALHE involves precise control over quantum anomalous Hall effect in different layers via spin-layer-chirality coupling.
- Van der Waals (vdW) layered materials are key to realizing advanced electronic properties.
Purpose of the Study:
- To propose the quantum anomalous layer Hall effect (QALHE) in valleytronic materials for the first time.
- To investigate the role of biaxial strain in controlling QALHE in vdW heterobilayers.
- To explore potential applications in spintronics and quantum layertronics.
Main Methods:
- Analysis of a low-energy effective model for vdW heterobilayers.
- Theoretical investigation of spin-layer-locked edge states and Chern numbers.
- Application of biaxial strain to tune chirality and achieve QALHE.
Main Results:
- Demonstration of QALHE in vdW heterobilayers through layer-localized, dissipationless currents.
- Validation of strain-tunable chirality of edge states and Chern numbers.
- Successful mechanism validation in realistic materials like VSi2N4/VSiCN4 and RuCl2/FeCl2 heterobilayers.
Conclusions:
- A novel mechanism for achieving QALHE in valleytronic heterobilayers is revealed.
- Biaxial strain offers a switchable control over QALHE properties.
- The findings pave the way for advanced spintronic and quantum layertronic devices.
Related Concept Videos
01:24Van der Waals Interactions
63.5K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
63.5K
01:10Van der Waals Equation
3.9K
The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
3.9K
04:01Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
34.4K
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
34.4K
01:27π Electron Effects on Chemical Shift: Overview
1.0K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.0K
01:27¹H NMR: Long-Range Coupling
1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.7K
02:35Noncovalent Attractions in Biomolecules
48.5K
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
48.5K