Unconventional spin-phonon coupling via the Dzyaloshinskii–Moriya interaction

Son, Jaeseok; Park, Byung Cheol; Kim, Choong Hyun; Cho, Hwanbeom; Kim, So Yeun; Sandilands, Luke J.; Sohn, Chae Hoon; Park, Je‐Geun; Moon, Seok‐Jun; Noh, Tae Won

doi:10.1038/s41535-019-0157-0

Cited by 52 publications

(32 citation statements)

References 67 publications

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“…Experimentally, the largest spin-phonon coupling is observed in a 5d perovskite oxide, corresponding to a frequency shift of 40 cm −1 . 75 In comparison, a frequency shift of ∼2.7 cm −1 is observed for the E g mode of the chromium-based 2D material Cr 2 Ge 2 Te 6 (CGT) around its T c . This corresponds to a λ of ∼ 1.2 cm −1 .…”

Section: Spin-phonon and Spin-lattice Couplingmentioning

confidence: 95%

A Combined First Principles Study of the Structural, Magnetic, and Phonon Properties of Monolayer CrI$_{3}$

Staros,

Hu,

Tiihonen

et al. 2021

Preprint

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The first magnetic 2D material discovered, monolayer (ML) CrI3, is particularly fascinating due to its ground state ferromagnetism. Yet, because monolayer materials are difficult to probe experimentally, much remains unresolved about ML CrI3's structural, electronic, and magnetic properties. Here, we leverage Density Functional Theory (DFT) and high-accuracy Diffusion Monte Carlo (DMC) simulations to predict lattice parameters, magnetic moments, and spin-phonon and spinlattice coupling of ML CrI3. We exploit a recently developed surrogate Hessian DMC line search technique to determine CrI3's monolayer geometry with DMC accuracy, yielding lattice parameters in good agreement with recently-published STM measurements-an accomplishment given the ∼ 10% variability in previous DFT-derived estimates depending upon the functional. Strikingly, we find previous DFT predictions of ML CrI3's magnetic spin moments are correct on average across a unit cell, but miss critical local spatial fluctuations in the spin density revealed by more accurate DMC. DMC predicts magnetic moments in ML CrI3 are 3.62 µB per chromium and -0.145 µB per iodine; both larger than previous DFT predictions. The large disparate moments together with the large spin-orbit coupling of CrI3's I-p orbital suggests a ligand superexchange-dominated magnetic anisotropy in ML CrI3, corroborating recent observations of magnons in its 2D limit. We also find ML CrI3 exhibits a substantial spin-phonon coupling of ∼ 3.32 cm −1 . Our work thus establishes many of ML CrI3's key properties, while also continuing to demonstrate the pivotal role DMC can assume in the study of magnetic and other 2D materials.

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Section: Spin-phonon and Spin-lattice Couplingmentioning

confidence: 95%

A Combined First Principles Study of the Structural, Magnetic, and Phonon Properties of Monolayer CrI$_{3}$

Staros,

Hu,

Tiihonen

et al. 2021

Preprint

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“…We will outline a few possible mechanisms to achieve this coupling, all of which exploit electron-phonon interactions. Within the context of ultrafast optics, phonomagnetic interactions are by now a well established way of coupling Terahertz optical fields to electronic spins [31,34,36,49,160,[190][191][192][193][194]. The combination of a relatively large electric dipole matrix element and strong electron-phonon interaction [195] at the appropriate energy scale also makes this a promising route for engineering linear coupling of spins to the cavity electromagnetic field.…”

Section: A Spin-orbit Couplingmentioning

confidence: 99%

Cavity magnon-polaritons in cuprate parent compounds

Curtis,

Grankin,

Poniatowski

et al. 2021

Preprint

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Cavity control of quantum matter may offer new ways to study and manipulate many-body systems. A particularly appealing idea is to use cavities to enhance superconductivity, especially in unconventional or high-Tc systems. Motivated by this, we propose a scheme for coupling Terahertz resonators to the antiferromagnetic fluctuations in a cuprate parent compound, which are believed to provide the glue for Cooper pairs in the superconducting phase. First, we derive the interaction between magnon excitations of the Neél-order and polar phonons associated with the planar oxygens. This mode also couples to the cavity electric field, and in the presence of spin-orbit interactions mediates a linear coupling between the cavity and magnons, forming hybridized magnon-polaritons. This hybridization vanishes linearly with photon momentum, implying the need for near-field optical methods, which we analyze within a simple model. We then derive a higher-order coupling between the cavity and magnons which is only present in bilayer systems, but does not rely on spin-orbit coupling. This interaction is found to be large, but only couples to the bimagnon operator. As a result we find a strong, but heavily damped, bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes in the strong-coupling regime. To conclude, we outline several interesting extensions of our theory, including applications to carrier-doped cuprates and other strongly-correlated systems with Terahertz-scale magnetic excitations.

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“…The spin-phonon coupling give rise a numerous intriguing physical phenomena in magnetic materials [52]. This coupling manifest itself in shifts of the phonon frequencies due to magnetic ordering and originates from the modulation of the superexchange integrals by lattice vibrations.…”

Section: Dynamical Modulation Of the Superexchange Interactions By Ph...mentioning

confidence: 99%

Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO$_3$

Dubrovin

Siverin²,

Prosnikov³

et al. 2020

Preprint

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Ilmenite-type crystals find a variety of technological applications due to their intriguing physical properties. We present the results of the lattice dynamics studies of honeycomb antiferromagnetic ilmenite CoTiO 3 single crystal by the complementary polarized infrared, Raman, and dielectric spectroscopic techniques that are supplemented by the DFT calculations. The frequencies and symmetries of all predicted infrared and Raman active phonons were uniquely identified. Furthermore, it was found that the dielectric permittivity demonstrates distinct changes below antiferromagnetic ordering temperature in zero magnetic field due to spontaneous magnetodielectric effect. Our results establish the reliable basis for further investigation of the coupling of phonons with spins, magnetic excitations and other physical phenomena of this promising material.

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Unconventional spin-phonon coupling via the Dzyaloshinskii–Moriya interaction

Cited by 52 publications

References 67 publications

A Combined First Principles Study of the Structural, Magnetic, and Phonon Properties of Monolayer CrI$_{3}$

A Combined First Principles Study of the Structural, Magnetic, and Phonon Properties of Monolayer CrI$_{3}$

Cavity magnon-polaritons in cuprate parent compounds

Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO$_3$

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