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Symmetry-Driven Multiferroic Altermagnetism in Two-Dimensional Materials
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DOI：10.1021/jacs.5c16402.png)
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Abstract
En 中文
Altermagnetism, characterized by momentum-dependent spin polarization in collinear antiparallel spins with vanishing net magnetization, represents a distinct magnetic phase beyond conventional ferromagnetic and antiferromagnetic classifications. This phenomenon arises from unique spin group symmetries that decouple spin and spatial degrees of freedom, enabling nonrelativistic spin-split electronic bands. Integrating this phenomenon with multiferroicity in two-dimensional (2D) materials offers unprecedented opportunities for quantum state manipulation. However, a unified theoretical framework for such multifunctional materials remains underdeveloped. Here, we establish a symmetry-driven framework identifying four point group species (14̅222mF2m2m12, 24̅122mF2m2m12, 24̅F22, and 222212F22) that can simultaneously host altermagnetism, ferroelasticity, and out-of-plane ferroelectricity, termed altriferroicity. First-principles calculations further validate this framework in Fe2WS2Se2 and half-fluorinated Cr-based metal–organic frameworks, revealing robust spin–lattice–charge coupling. Our work establishes symmetry-guided design as a powerful approach for unlocking emergent quantum phenomena in 2D materials for spintronic and valleytronic applications.
Keywords:
Group theory
Magnetic properties
Polarization
Quantum mechanics
Two dimensional materials
Journal
IF:
15.6
Papers:
20.0W
Citations:
60.2W