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PreprintCC BY 4.0arXiv

Tunable Mixed Parity Spin Splittings in Altermagnets

  • Yue Yu
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Abstract

Momentum-dependent spin splitting and its relation to inversion (P) and time-reversal (T) symmetries are central to nonrelativistic spintronics. Representative examples include collinear altermagnets with (P,T)=(+,−) and non-collinear odd-parity magnets with (P,T)=(−,+). In this work, we develop a theoretical framework to induce odd-parity spin splittings in the more abundant collinear altermagnets through two mechanisms: driving by a two-color linearly polarized light field or coupling to a P-odd loop-current order. Properly phase-locked two-color driving induces a static (P,T)=(−,−) order, symmetry-equivalent to a translationally invariant P-odd loop-current order. Coupling this order to an altermagnet produces a controllable mixed-parity spin texture, opening new avenues for the electrical and optical manipulation of spin-polarized currents in spintronics applications. The same mechanism applied to a collinear PT-symmetric magnet induces a distinct (P,T)=(+,+) state with a nonrelativistic dissipationless anomalous spin Hall conductivity. We present group-theory and microscopic Floquet theory to highlight the emergent responses.

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Cite

BibTeXRIS
BibTeX
@misc{yu2026tunable,
  title = {{Tunable Mixed Parity Spin Splittings in Altermagnets}},
  author = {Yue Yu},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.03026},
  eprint = {2605.03026},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.03026},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Tunable Mixed Parity Spin Splittings in Altermagnets
AU  - Yue Yu
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2605.03026
UR  - https://arxiv.org/abs/2605.03026
AB  - Momentum-dependent spin splitting and its relation to inversion (P) and time-reversal (T) symmetries are central to nonrelativistic spintronics. Representative examples include collinear altermagnets with (P,T)=(+,−) and non-collinear odd-parity magnets with (P,T)=(−,+). In this work, we develop a theoretical framework to induce odd-parity spin splittings in the more abundant collinear altermagnets through two mechanisms: driving by a two-color linearly polarized light field or coupling to a P-odd loop-current order. Properly phase-locked two-color driving induces a static (P,T)=(−,−) order, symmetry-equivalent to a translationally invariant P-odd loop-current order. Coupling this order to an altermagnet produces a controllable mixed-parity spin texture, opening new avenues for the electrical and optical manipulation of spin-polarized currents in spintronics applications. The same mechanism applied to a collinear PT-symmetric magnet induces a distinct (P,T)=(+,+) state with a nonrelativistic dissipationless anomalous spin Hall conductivity. We present group-theory and microscopic Floquet theory to highlight the emergent responses.
ER  -