Theory of spin waves in a hexagonal antiferromagnet

Dasgupta, Sayak; Tchernyshyov, Oleg

doi:10.1103/physrevb.102.144417

Cited by 27 publications

(28 citation statements)

References 31 publications

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“…In certain cases, the low-energy magnetic dynamics can be described by the U(1)-symmetric theory augmented by small perturbative terms capturing the symmetry-breaking effect, e.g. the hexagonal symmetries treated in Refs [64,65]…”

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confidence: 99%

Transport signature of the magnetic Berezinskii-Kosterlitz-Thouless transition

Kim

Chung

2021

SciPost Phys.

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Motivated by recent experimental progress in 2D magnetism, we theoretically study spin transport in 2D easy-plane magnets at finite temperatures across the Berezinskii-Kosterlitz-Thouless (BKT) phase transition, by developing a duality mapping to the 2+1D electromagnetism with the full account of spin’s finite lifetime. In particular, we find that the non-conservation of spin gives rise to a distinct signature across the BKT transition, with the spin current decaying with distance power-law (exponentially) below (above) the transition; this is detectable in the proposed experiment with NiPS_33 and CrCl_33.

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confidence: 99%

Transport signature of the magnetic Berezinskii-Kosterlitz-Thouless transition

Kim

Chung

2021

SciPost Phys.

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“…To determine the tensorP i j for a hexagonal-symmetry lattice, kagome or triangular, when exchange is the dominant interaction, we explore the spin wave behavior by following Ref. [35]. We consider small fluctuations on the reference state by usingR = exp[−iθ •Ĵ ], where (J i ) jk = −i i jk with i jk is the Levi-Civita tensor and a vector θ describes the small deviation with |θ| 1.…”

Section: Long-wavelength Hamiltonianmentioning

confidence: 99%

“…Here, ω 1 corresponds to the scalar mode θ z , and ω 2,3 comes from the vector modes θ x , θ y [35].…”

Section: Long-wavelength Hamiltonianmentioning

confidence: 99%

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Spin superfluidity in noncollinear antiferromagnets

Kovalev

2021

Phys. Rev. B

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We explore the spin superfluid transport in exchange interaction-dominated three-sublattice antiferromagnets. The system in the long-wavelength regime is described by an SO(3) invariant field theory. Additional corrections from Dzyaloshinskii-Moriya interactions or anisotropies can break the symmetry; however, the system still approximately holds a U(1)-rotation symmetry. Thus, the power-law spatial decay signature of spin superfluidity is identified in a nonlocal-measurement setup where the spin injection is described by the generalized spin-mixing conductance. We suggest iron jarosites as promising material candidates for realizing our proposal.

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“…The magnetization density follows the soft mode dynamics and renders an inertial mass to the soft modes. Thus the dynamics in the antiferromagnet is inertial-A force produces a linear acceleration, not a precession [7,11].…”

Section: Introductionmentioning

confidence: 99%

Zeeman term for the Néel vector in a two sublattice antiferromagnet using Dzyaloshinsky-Moriya interaction and magnetic field

Dasgupta,

Zou

2021

Preprint

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We theoretically investigate the dynamics of solitons in two sublattice antiferromagnets under external perturbations, focusing on the effect of Dzyaloshinsky-Moriya (DM) interactions. To this end, we construct a micromagnetic field theory for the antiferromagnet in the presence of the external magnetic field, DM interaction, and spin-transfer torque. In particular, we show external magnetic field and spin current couple to Néel vector in a Zeeman-like manner when DM interactions present, which can be used to efficiently drive an antiferromagnetic domain wall. Besides, we study the effect of straining the local lattice. It can serve as an external handle on the Néel field inertia and thus dynamical properties. Our findings may find applications in antiferromagnetic spintronics.

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Theory of spin waves in a hexagonal antiferromagnet

Cited by 27 publications

References 31 publications

Transport signature of the magnetic Berezinskii-Kosterlitz-Thouless transition

Transport signature of the magnetic Berezinskii-Kosterlitz-Thouless transition

Spin superfluidity in noncollinear antiferromagnets

Zeeman term for the Néel vector in a two sublattice antiferromagnet using Dzyaloshinsky-Moriya interaction and magnetic field

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