Magnon gravitomagnetoelectric effect in noncentrosymmetric antiferromagnetic insulators

Shitade, Atsuo; Yanase, Youichi

doi:10.1103/physrevb.100.224416

Cited by 10 publications

(8 citation statements)

References 49 publications

(54 reference statements)

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“…Likewise the magnetic moments of magnons of coplanar magnets lie within that plane. This reasoning is widely accepted and adopted for a plethora of transport phenomena that involve the magnon magnetic moment, such as the spin Seebeck [5], spin Nernst [6][7][8][9][10][11][12][13][14], and magnon Edelstein effect [15,16] in ferromagnets [17] and in both collinear [18][19][20] and noncollinear [13,14,[21][22][23] antiferromagnets.…”

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confidence: 99%

Orbital Magnetic Moment of Magnons

et al. 2020

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In experiments and applications usually the spin magnetic moment of magnons is considered. In this Paper we identify an additional degree of freedom of magnons: an orbital magnetic moment brought about by spin-orbit coupling. Our microscopic theory uncovers that spin magnetization M S and orbital magnetization M O are independent quantities. They are not necessarily collinear; thus, even when the total spin moment is compensated due to antiferromagnetism (M S = 0), M O may be nonzero. This scenario of orbital weak ferromagnetism is realized in paradigmatic kagome antiferromagnets with Dzyaloshinskii-Moriya interaction. We demonstrate that magnets exhibiting a magnonic orbital moment are omnipresent and propose transport experiments for probing it.

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confidence: 99%

Orbital Magnetic Moment of Magnons

et al. 2020

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“…Quantum spin liquids are defined as materials whose magnetic configuration emerges out of frustration and displays high topological ground-state degeneracy, long-range entanglement, and a fractionalization of the elementary excitations. Confined to theoretical prospects for several decades, this vast field of research has experienced an outstanding burst with the synthesis of the first quantum spin liquid candidate based on a kagomé antiferromagnet (Shores et al, 2005), as illustrated on Fig. 41.…”

Section: Topological Excitations In Quantum Antiferromagnetsmentioning

confidence: 99%

Topological Aspects of Antiferromagnets

Bonbien,

Zhuo,

Salimath

et al. 2021

Preprint

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Magnonic topological insulators 39 2. Magnonic Weyl and Dirac semimetals 40 V. Topological Antiferromagnetic Textures 41 A. Antiferromagnetic solitons in one-dimension 41 B. Antiferromagnetic skyrmions 43 C. Textures in noncollinear antiferromagnets 44 D. Current-driven torques and skyrmion motion 45 E. Topological transport in non-trivial solitons 46 VI. Topological Excitations in Quantum Antiferromagnets 47 A. Frustrations, fractional excitations and topology 49 B. Topological spinons in kagomé antiferromagnets 50 C. Majorana fermions in Kitaev honeycomb lattices 51 D. Spinons in triangular antiferromagnets 53 E. Monopoles and Dirac strings in magnetic pyrochlores 53 F. A new playground for spintronics 55 VII. Perspectives 56 Acknowledgements 57 References 57

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“…As this is a higher-rank multipole of the magnetic dipole, it is defined as the spatial distributions of the magnetic moments, such as the spin and orbital angular momenta. A typical example to exhibit the MQ is the antiferromagnetic ordering without the spatial inversion symmetry, which has been discussed in the context of multiferroic materials in magnetic insulators [54][55][56][57][58], such as Cr 2 O 3 [59][60][61][62][63], Ba(TiO)Cu 4 (PO 4 ) 4 [64][65][66], Co 4 Nb 2 O 9 [67][68][69][70][71], and KOsO 4 [72][73][74]. Meanwhile, such ordering has recently been discussed in magnetic metals [75][76][77][78], such as BaMn 2 As 2 [79,80], as it could exhibit intriguing current-induced magnetization and distortion.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

Hayami,

Kusunose

2021

Preprint

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Odd-parity magnetic and magnetic toroidal multipoles in the absence of both spatial-inversion and timereversal symmetries are sources of multiferroic and nonreciprocal optical phenomena. We investigate electronic states caused by an emergent odd-parity magnetic quadrupole (MQ) as a representative example of magnetic odd-parity multipoles. It is shown that spontaneous ordering of the MQ leads to an antisymmetric spin-orbital polarization in momentum space, which corresponds to a spin-orbital momentum locking at each wave vector. By symmetry argument, we show that the orbital or sublattice degree of freedom is indispensable to give rise to the spin-orbital momentum locking. We demonstrate how the electronic band structures are modulated by the MQ ordering in the three-orbital system, in which the MQ is activated by the spin-dependent hybridization between the orbitals with different spatial parities. The spin-orbital momentum locking is related with the microscopic origin of cross-correlated phenomena, e.g., the magnetic-field-induced symmetric and antisymmetric spin polarization in the band structure, the current-induced distortion, and the magnetoelectric effect. We also discuss similar spin-orbital momentum locking in antiferromagnet where the MQ degree of freedom is activated through the antiferromagnetic spin structure in a sublattice system.

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Magnon gravitomagnetoelectric effect in noncentrosymmetric antiferromagnetic insulators

Cited by 10 publications

References 49 publications

Orbital Magnetic Moment of Magnons

Orbital Magnetic Moment of Magnons

Topological Aspects of Antiferromagnets

Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering

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