Light-Induced Control of Magnetic Phases in Kitaev Quantum Magnets

Sriram, Adithya; Claassen, Martin

doi:10.48550/arxiv.2105.01062

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…Such recent studies include Ref. 38. In addition, our results may be useful for realizing a gapped spin liqud, a toric code phase 39,40 , because it could be stabilized in the presence of strong bond anisotropy of the exchange interactions.…”

Section: B Resultsmentioning

confidence: 75%

Polarization-dependent magnetic properties of periodically driven $α$-RuCl$_{3}$

Arakawa,

Yonemitsu

2021

Preprint

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We study magnetic properties of a periodically driven Mott insulator with strong spin-orbit coupling and show some properties characteristic of linearly polarized light. We consider a t2g-orbital Hubbard model driven by circularly or linearly polarized light with strong spin-orbit coupling and derive its effective Hamiltonian in the strong-interaction limit for a high-frequency case. We show that linearly polarized light can change not only the magnitudes and signs of the exchange interactions, but also their bond anisotropy even without the bond-anisotropic hopping integrals. Because of this property, the honeycomb-network spin system could be transformed into weakly coupled zigzag or step spin chains for the light field polarized along the b-or a-axis, respectively. Then, analyzing how the light fields affect several magnetic states in a mean-field approximation, we show that linearly polarized light can change the relative stability of the competing magnetic states, whereas such a change is absent for circularly polarized light. We also analyze the effects of both the bond anisotropy of nearest-neighbor hopping integrals and a third-neighbor hopping integral on the magnetic states and show that the results obtained in a simple model, in which the bondaveraged nearest-neighbor hopping integrals are considered, remain qualitatively unchanged except for the stability of zigzag states in the non-driven case and the degeneracy lifting of the zigzag or stripy states.

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Section: B Resultsmentioning

confidence: 75%

Polarization-dependent magnetic properties of periodically driven $α$-RuCl$_{3}$

Arakawa,

Yonemitsu

2021

Preprint

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“…Note that a circularly-polarized-light-induced effective magnetic field in the direction perpendicular to the honeycomb lattice is derived in a different manner by considering ligand p orbitals and ligand-mediated third-order hopping processes in a strong-coupling perturbation theory for the J eff = 1 2 pseudospins. 73,74) On the other hand, the present field is derived by second-order hopping processes. Within the J eff = 1 2 11/34 subspace, Eq.…”

Section: High-frequency Expansion In Floquet Theorymentioning

confidence: 99%

Photoinduced Pseudospin Polarization in a Three-Orbital Hubbard Model

Yonemitsu¹

2022

Preprint

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In a Hubbard model for the Kitaev spin-liquid candidate material α-RuCl 3 with three t 2g orbitals per Ru site, we calculate photoinduced dynamics based on the exact diagonalization method and interpret them with the help of a high-frequency expansion in quantum Floquet theory. The high-frequency expansion shows two types of effective magnetic fields during the application of a circularly polarized light field. One of them originates from spin-orbit coupling and is within the honeycomb lattice. The other is of purely kinetic origin and perpendicular to the lattice. The former fields are antiparallel at the two sites within a unit cell and rotate in accordance with the momentum distribution of holes that follow the light field.When the light field is weak, pseudospin dynamics are governed by the former fields; thus, the average of the pseudospins almost vanishes. The latter fields are parallel at the two sites within a unit cell and produce nonzero perpendicular components of the pseudospins when the light field is strong. Numerically obtained perpendicular components are consistent with the latter fields when the frequency of the light field is well below the Mott gap. The relevance to the inverse Faraday effect recently observed in α-RuCl 3 is discussed.

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“…A prime example of spatially anisotropic control of quantum interactions is the ultrafast control of exchange interactions, which recently has emerged as a central tool for the manipulation of quantum materials [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. In this case, the light-matter interaction depends on the relative orientation of the laser field polarization and the exchange bonds, resulting in homogeneous but spatially anisotropic perturbations.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast dynamics of entanglement in Heisenberg antiferromagnets

Fabiani¹,

Mentink²

2022

Phys. Rev. B

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We investigate entanglement dynamics in the antiferromagnetic Heisenberg model in two dimensions following a spatially anisotropic quench of the exchange interactions. Opposed to established results in one dimension, the magnon quasiparticles show an initial growth of entanglement dynamics that does not depend on the system size and is governed by the oscillation period of the exchange interaction. We ascribe this to the dominance of the intrinsic entanglement of short wavelength nonpropagating magnon pairs, which also leads to a competition between area-law and volume-law contribution in the entanglement dynamics. Furthermore, by adopting the neural-network quantum states, we provide numerical evidence that this behavior survives even in the presence of strong magnon-magnon interactions, suggesting intriguing avenues for manipulating entanglement dynamics in quantum materials.

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Light-Induced Control of Magnetic Phases in Kitaev Quantum Magnets

Cited by 4 publications

References 37 publications

Polarization-dependent magnetic properties of periodically driven $α$-RuCl$_{3}$

Polarization-dependent magnetic properties of periodically driven $α$-RuCl$_{3}$

Photoinduced Pseudospin Polarization in a Three-Orbital Hubbard Model

Ultrafast dynamics of entanglement in Heisenberg antiferromagnets

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