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Chiral magnon in ferromagnetic chiral crystals

We theoretically propose chiral magnon in ferromagnetic chiral crystals. We show that the crystal chirality is imprinted in orbital angular momentum of magnons which exhibits the opposite signs for opposite chiralities of the crystal. We also show th

Externí odkaz: http://arxiv.org/abs/2404.19219

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Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors

Autor: Yao, Dapeng, Matsuo, Mamoru, Yokoyama, Takehito

Publikováno v: Appl. Phys. Lett. 124, 162603 (2024)

The recent experiment [R. Nakajima, et al., Nature 613, 479 (2023)] has reported a pair of oppositely polarized spins under an alternating electric current in a superconductor with a chiral structure. However, these behaviors cannot be explained by t

Externí odkaz: http://arxiv.org/abs/2401.04497

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Conversion of chiral phonons into magnons in ferromagnets and antiferromagnets

Autor: Yao, Dapeng, Murakami, Shuichi

Publikováno v: J. Phys. Soc. Jpn. 93, 034708 (2024)

Chiral phonons with atomic rotations converted into electron spins result in a change of spin magnetizations in crystals. In this paper, we investigate a new conversion of chiral phonons into magnons both in ferromagnets and antiferromagnets by spin

Externí odkaz: http://arxiv.org/abs/2304.14000

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Bayesian Sparse Gaussian Mixture Model in High Dimensions

Autor: Yao, Dapeng, Xie, Fangzheng, Xu, Yanxun

We study the sparse high-dimensional Gaussian mixture model when the number of clusters is allowed to grow with the sample size. A minimax lower bound for parameter estimation is established, and we show that a constrained maximum likelihood estimato

Externí odkaz: http://arxiv.org/abs/2207.10301

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Chiral-phonon-induced current in helical crystals

Autor: Yao, Dapeng, Murakami, Shuichi

Publikováno v: Phys. Rev. B 105, 184412 (2022)

In this study, we theoretically show that in a helical crystal, a current is induced by chiral phonons representing the microscopic local rotation of atoms. By treating the rotational motion as a perturbation, we calculate the time-dependent current

Externí odkaz: http://arxiv.org/abs/2203.09801

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Ab initio study on the possible magnetic topological semimetallic state in MnMg$_{2}$O$_{4}$}

Autor: Tomita, Satoshi, Yao, DaPeng, Tsuchiura, Hiroki, Nomura, Kentaro

Publikováno v: AIP Advances 12, 035331 (2022)

We study the electronic state of an inverse spinel compound MnMg$_{2}$O$_{4}$ based on first-principles calculations. The high-spin state is realized in Mn ions on the diamond lattice, resulting in that this material is found to be a half-metallic se

Externí odkaz: http://arxiv.org/abs/2201.07440

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