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Quantum anomalous valley Hall effect in ferromagnetic MXenes with asymmetric functionalization
Shuo Li1, Thomas Frauenheim2, Junjie He3
1Institute for Advanced Study, Chengdu University, Chengdu 610106, P. R. China. shuoli.phd@gmail.com.
Nanoscale
|October 13, 2023
Summary
Researchers theoretically demonstrate intrinsic ferrovalley polarization in functionalized MXenes. This discovery opens new avenues for advanced valleytronics and spintronics applications using quantum anomalous valley Hall effect materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Two-dimensional (2D) hexagonal lattices with inversion asymmetry and time-reversal symmetry offer potential for valleytronics.
- MXenes, a class of 2D materials, can be functionalized to break inversion symmetry.
Purpose of the Study:
- To theoretically investigate the induction of intrinsic ferrovalley polarization in MXenes via asymmetric surface functionalization.
- To explore the potential of functionalized magnetic MXenes as quantum anomalous valley Hall effect (QAVHE) materials.
Main Methods:
- Berry curvature calculations
- Edge state analysis
- Theoretical modeling of functionalized Cr2COF MXene
Main Results:
- Ferromagnetic Cr2COF MXene with Janus functionalization exhibits intrinsic Chern insulator properties.
- Demonstrated large spin-valley polarization in the functionalized MXene.
- Identified the material as a QAVHE material based on theoretical calculations.
Conclusions:
- Asymmetric functionalization of magnetic MXenes can induce desirable spin-valley coupling.
- Functionalized MXenes offer a promising platform for realizing QAVHE.
- This research provides theoretical insights for advancing valleytronics and spintronics.
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