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d-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets.
Zhao Liu1,2,3, Nikhil V Medhekar2,3
1Centre of Quantum Technology Theory, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
We discovered d-wave polarization-spin locking (PSL) in 2D altermagnets, a new phenomenon where spin-up and spin-down electrons exhibit perpendicular polarizations. This finding opens doors for advanced spintronic devices and novel memory technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Two-dimensional (2D) altermagnets exhibit unique electronic properties.
- Understanding spin-dependent phenomena is crucial for next-generation electronics.
Purpose of the Study:
- To report the discovery of d-wave polarization-spin locking (PSL) in 2D altermagnets.
- To establish criteria for identifying materials exhibiting d-wave PSL.
- To explore potential applications of this phenomenon.
Main Methods:
- Theoretical proposal of a symmetry-eigenvalue criterion.
- Experimental observation of spin-momentum locking.
- First-principles calculations for material candidate identification.
Main Results:
- Emergence of d-wave PSL due to nontrivial Berry connections.
- Perpendicular electronic polarizations in spin-up and spin-down channels.
- Identification of monolayer Cr2X2O (X = Se, Te) as promising candidates.
- Observation of spin-driven ferroelectricity in antiferromagnets.
Conclusions:
- D-wave PSL enables orthogonal spin accumulation for spintronic applications like spin filters/splitters.
- This phenomenon provides a platform for fast antiferromagnetic memory devices through magnetoelectric coupling.
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