Floquet spin-group theory for light-tailored spin splitting in collinear magnets

@misc{zhu2026floquet,
  title = {{Floquet spin-group theory for light-tailored spin splitting in collinear magnets}},
  author = {Tongshuai Zhu and Zixuan Li and Huaiqiang Wang and Su-Huai Wei and Jiawei Ruan},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.02393},
  eprint = {2608.02393},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.02393},
}

TY  - UNPB
TI  - Floquet spin-group theory for light-tailored spin splitting in collinear magnets
AU  - Tongshuai Zhu
AU  - Zixuan Li
AU  - Huaiqiang Wang
AU  - Su-Huai Wei
AU  - Jiawei Ruan
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2608.02393
UR  - https://arxiv.org/abs/2608.02393
AB  - Spin groups have emerged as a fundamental symmetry framework for spin-splitting antiferromagnets, including altermagnets. For periodically driven magnets, where new spin-splitting electronic structures can emerge beyond equilibrium, an analogous symmetry theory is still lacking. Here, we develop a Floquet spin-group theory for optically driven collinear magnets by combining the static spin group of the magnetic crystal with the dynamical symmetry group of the light field. This theory determines the symmetry-allowed parity, momentum dependence, and nodal structure of light-induced spin splitting under general periodic driving. We show that odd-, even-, and mixed-parity spin splittings can be selectively switched within the same material by tailoring the drive symmetry, accompanied by distinct symmetry-allowed transport responses. We further uncover higher-order h- and k-wave Floquet spin splittings unique to three-dimensional systems. Our work extends spin-group theory from static magnets to periodically driven systems, providing a general symmetry principle for engineering light-controlled nonequilibrium spin-resolved electronic structures.
ER  -