Conversion between electron spin and microscopic atomic rotation

Hamada, Masato; Murakami, Shuichi

doi:10.1103/physrevresearch.2.023275

Cited by 30 publications

(25 citation statements)

References 34 publications

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“…The angular momentum of a rigid body rotation 3 and photon 4,5 can be also used to control the magnetization. One might wonder whether it is possible to control the magnetization via the angular momentum transfer from phonons [6][7][8][9] (Fig. 1b).…”

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confidence: 99%

Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Sasaki

Nii

2021

Nat Commun

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Interconversion between electron spin and other forms of angular momentum is useful for spin-based information processing. Well-studied examples of this are the conversion of photon angular momentum and rotation into ferromagnetic moment. Recently, several theoretical studies have suggested that the circular vibration of atoms work as phonon angular momentum; however, conversion between phonon angular momentum and spin-moment has yet to be demonstrated. Here, we demonstrate that the phonon angular momentum of surface acoustic wave can control the magnetization of a ferromagnetic Ni film by means of the phononic-to-electronic conversion of angular momentum in a Ni/LiNbO3 hybrid device. The result clearly shows that the phonon angular momentum is useful for increasing the functionality of spintronic devices.

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confidence: 99%

Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Sasaki

Nii

2021

Nat Commun

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“…Recent experiments suggest the phononic-to-electronic conversion of angular momentum [99,100]. For example, the phonon angular momentum of the surface acoustic wave can control the magnetization of a ferromagnetic layer, what was shown in the case of Ni film in Ni/LiNbO 3 hybrid device [101].…”

Section: Proposed Experimental Detectionmentioning

confidence: 91%

Chiral phonons in honeycomb sublattice of layered CoSn-like compounds

Ptok,

Kobiałka,

Sternik

et al. 2021

Preprint

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Hexagonal and kagome lattices exhibit extraordinary electronic properties. It is a natural consequence of additional discrete degree of freedom associated with a valley or the occurence of electronic flat-bands. Combination of both types of lattices, observed in CoSn-like compounds, leads not only to the topological electronic behavior, but also to the emergence of chiral phonon modes. Here, we study CoSn-like compounds in the context of realization of chiral phonons. Previous theoretical studies demonstrated that the chiral phonons can be found in ideal two-dimensional hexagonal or kagome lattices. However, it turns out that in the case of CoSn-like systems with the P 6/mmm symmetry, the kagome lattice formed by d-block element is decorated by the additional p-block atom. This results in a two dimensional triangular lattice of atoms with non-equal masses and the absence of chiral phonons in the kagome plane. Contrary to this, the interlayer hexagonal lattice of p-block atoms is preserved and allows for the realization of chiral phonons. We discuss properties of these chiral phonons in seven CoSn-like compounds and demonstrate that they do not depend on atomic mass ratio or the presence of intrinsic magnetic order. The chiral phonons of d-block atoms can be restored by removing the inversion symmetry. The latter is possible in the crystal structure of CoGe and RhPb with the reduced symmetry (P 62m) and distorted-kagome-like lattice.

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“…The narrow distribution of the the molecular Berry curvature in momentum space indicates that, in real space, one atom can be influenced by the velocity of another atom far away. With the molecular Berry curvature, the double degeneracy of the optical phonon at the Brillouin zone center is lifted intrinsically, in contrast to the splitting induced extrinsically by the magnetic field [14][15][16][17][18][19][20][21] . The polarization vectors become left and right-handed, separately, which carry nonzero angular momenta contributing to a nonzero zero-point angular momentum of the lattice vibration 22 .…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics with molecular Berry curvature: chiral optical phonons

Saparov,

Xiong,

Ren

et al. 2021

Preprint

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Conversion between electron spin and microscopic atomic rotation

Cited by 30 publications

References 34 publications

Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Magnetization control by angular momentum transfer from surface acoustic wave to ferromagnetic spin moments

Chiral phonons in honeycomb sublattice of layered CoSn-like compounds

Lattice dynamics with molecular Berry curvature: chiral optical phonons

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