Ferroelectric switching of odd-parity magnon spin splitting

@misc{liang2026ferroelectric,
  title = {{Ferroelectric switching of odd-parity magnon spin splitting}},
  author = {Yuhan Liang and Xingyu Yan and Bowen Hao and Ziye Zhu and Tianle Sui and Daniel Pharis and Xiaoxi Huang and Rakshit Jain and Tong Zhou and Di Yi and Wanjun Jiang and Pu Yu and Igor Žutić and Yuan-Hua Lin and Daniel C. Ralph and Tianxiang Nan},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.24182},
  eprint = {2609.24182},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.24182},
}

TY  - UNPB
TI  - Ferroelectric switching of odd-parity magnon spin splitting
AU  - Yuhan Liang
AU  - Xingyu Yan
AU  - Bowen Hao
AU  - Ziye Zhu
AU  - Tianle Sui
AU  - Daniel Pharis
AU  - Xiaoxi Huang
AU  - Rakshit Jain
AU  - Tong Zhou
AU  - Di Yi
AU  - Wanjun Jiang
AU  - Pu Yu
AU  - Igor Žutić
AU  - Yuan-Hua Lin
AU  - Daniel C. Ralph
AU  - Tianxiang Nan
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.24182
UR  - https://arxiv.org/abs/2609.24182
AB  - Magnetic symmetry can lift spin degeneracy in momentum space without producing net magnetization, generating spin textures classified by their parity under momentum reversal. Even-parity textures have well established in altermagnets. Odd-parity spin textures have recently emerged in electronic bands of compensated magnets, but their counterpart in collective bosonic excitations remains experimentally unresolved. Magnons provide a natural setting for this extension because they carry spin angular momentum through insulating magnets without accompanying charge flow. Beyond realizing this missing state, a broader challenge is to program spin splitting with voltage at room temperature. Here we report room-temperature transport evidence for ferroelectric switching odd-parity magnon spin splitting in multiferroic BiFeO3. Symmetry analysis and spin-wave calculations reveal that the cycloidal chirality splits opposite-spin magnon branches with an odd-in-momentum dependence and sets the sign. Experimentally, an injected in-plane-polarized spin current generates an out-of-plane magnon spin component during propagation. This component exhibits the crystalline angular dependence predicted by theory and reverses upon ferroelectric switching, providing a transport fingerprint of the spin-split magnon state. We use the programmed magnon spin to drive deterministic field-free switching of a perpendicular ferromagnet and demonstrate XNOR logic-in-memory. Our results extend odd-parity spin splitting from fermionic electronic states to bosonic collective modes and establish nonvolatile electrical control at room temperature.
ER  -