Abstract
Efficient generation of spin polarization is very important for spintronics and quantum computation. In chiral materials without magnetic order nor spin-orbit coupling, we find a new spin selectivity effect—chiral phonon activated spin Seebeck (CPASS) effect. Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient, the CPASS coefficients are computed based on the Boltzmann transport theory. With both the phonon-drag and band transport contributions, the spin accumulations generated by the CPASS effect exhibit quadratic dependence on the temperature gradient. The strength of the CPASS effect and the relative magnitude of both contributions are tunable by the chemical potential modulation. The CPASS effect, which gives a promising explanation on the traditional chiral-induced spin selectivity effect, provides opportunities for the exploration of advanced spintronic devices based on chiral materials even in the absence of any magnetic order and spin-orbit coupling.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 12374044, 11904173, 11890703, and 12275133). Xiao Li was also supported by the Jiangsu Specially-Appointed Professor Program. Jun Zhou is supported by the National Key R&D Project from Ministry of Science and Technology of China (Grant No. 2022YFA1203100), and the “Shuangchuang” Doctor Program of Jiangsu Province (Grant No. JSS-CBS20210341).
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Li, X., Zhong, J., Cheng, J. et al. Chiral phonon activated spin Seebeck effect in chiral materials. Sci. China Phys. Mech. Astron. 67, 237511 (2024). https://doi.org/10.1007/s11433-023-2281-x
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DOI: https://doi.org/10.1007/s11433-023-2281-x