Laser-induced magnetization curve

Takayoshi, Shintaro; Sato, Masahiro; Oka, Takashi

doi:10.1103/physrevb.90.214413

Cited by 69 publications

(79 citation statements)

References 56 publications

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“…This formalism is mostly dominated by electronic systems [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] and also optical bosonic systems [60][61][62][63][64][65]. Moreover, an applied laser field provides a means for coherent control of the magnetization in 1D quantum magnets [66][67][68][69][70].…”

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confidence: 99%

Floquet topological magnons

Owerre¹

2017

J. Phys. Commun.

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We introduce the concept of Floquet topological magnons-a mechanism by which a synthetic tunable Dzyaloshinskii-Moriya interaction (DMI) can be generated in quantum magnets using circularly polarized electric (laser) field. The resulting effect is that Dirac magnons and nodal-line magnons in two-dimensional and three-dimensional quantum magnets can be tuned to magnon Chern insulators and Weyl magnons respectively under circularly polarized laser field. The Floquet formalism also yields a tunable intrinsic DMI in insulating quantum magnets without an inversion center. We demonstrate that the Floquet topological magnons possess a finite thermal Hall conductivity tunable by the laser field.

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confidence: 99%

Floquet topological magnons

Owerre¹

2017

J. Phys. Commun.

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“…43,[50][51][52][53] The wave function is represented as the matrix-product state form as |Ψ = σ1,σ2,...…”

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confidence: 99%

Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model

Hashimoto¹,

Ishihara²

2017

Phys. Rev. B

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Transient quantum dynamics in an interacting fermion-phonon system are investigated. In particular, a charge order (CO) melting after a short optical-pulse irradiation and roles of the quantum phonons on the transient dynamics are focused on. A spinless-fermion model in a one-dimensional chain coupled with local phonons is analyzed numerically. The infinite time-evolving block decimation algorithm is adopted as a reliable numerical method for one-dimensional quantum many-body systems. Numerical results for the photoinduced CO melting dynamics without phonons are well interpreted by the soliton picture for the CO domains. This interpretation is confirmed by the numerical simulation for an artificial local excitation and the classical soliton model. In the case of the large phonon frequency corresponding to the antiadiabatic condition, the CO melting is induced by propagations of the polaronic solitons with the renormalized soliton velocity. On the other hand, in the case of the small phonon frequency corresponding to the adiabatic condition, the first stage of the CO melting dynamics occurs due to the energy transfer from the fermionic to phononic systems, and the second stage is brought about by the soliton motions around the bottom of the soliton band. Present analyses provide a standard reference for the photoinduced CO melting dynamics in low-dimensional many-body quantum systems.

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“…This framework can also be applied to quantum magnets. Laser-induced magnetization growth in general quantum magnets [17,18] as well as laser-driven topological spin states [18,19], a quantum spin versions of Floquet topological insulators, were proposed recently.In the current work, we apply the Floquet theory to quantum multiferroics and study the synthetic interactions appearing in the effective Floquet Hamiltonian …”

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Laser-Driven Multiferroics and Ultrafast Spin Current Generation

2016

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We propose an ultrafast way to generate spin chirality and spin current in a class of multiferroic magnets using a terahertz circularly polarized laser. Using the Floquet formalism for periodically driven systems, we show that it is possible to dynamically control the Dzyaloshinskii-Moriya interaction in materials with magnetoelectric coupling. This is supported by numerical calculations, by which additional resonant phenomena are found. Specifically, when a static magnetic field is applied in addition to the circularly polarized laser, a large resonant enhancement of spin chirality is observed resembling the electron spin resonance. Spin current is generated when the laser is spatially modulated by chiral plasmonic structures and could be detected using optospintronic devices. DOI: 10.1103/PhysRevLett.117.147202 Introduction.-Control of emergent collective phenomena by external fields is an important problem in condensed matter. Multiferroic magnets (for a review, see Refs. [1][2][3]) are opening new possibilities in this direction since the local spins are coupled not only to magnetic fields but to electric fields through the magnetoelectric (ME) coupling. Laser control of materials is attracting interest with a goal of realizing ultrafast and noncontact manipulation [4][5][6][7][8][9][10][11][12][13][14]. In the research community of magnetic systems, control of magnetism using a laser is being studied in the context of spin-pumping and spintronics [4][5][6][7]. On the other hand, in the field of electronic systems, periodically driven quantum systems draw the interest of many researchers. When the Hamiltonian is time periodic, the system can be described by the so-called Floquet states [15,16], a temporal analog of the Bloch states, and it is possible to control their quantum nature. For noninteracting systems, the control of the band topology has been studied theoretically [8][9][10] and experimentally [13,14]. It is possible to understand the effect of a laser through a mapping from the time-dependent Hamiltonian to a static effective Hamiltonian using the Floquet theory, and the change of quantum state, e.g., topology and symmetry, is attributed to the emergent terms in the static effective Hamiltonian. This framework can also be applied to quantum magnets. Laser-induced magnetization growth in general quantum magnets [17,18] as well as laser-driven topological spin states [18,19], a quantum spin versions of Floquet topological insulators, were proposed recently.In the current work, we apply the Floquet theory to quantum multiferroics and study the synthetic interactions appearing in the effective Floquet Hamiltonian

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Laser-induced magnetization curve

Cited by 69 publications

References 56 publications

Floquet topological magnons

Floquet topological magnons

Photoinduced charge-order melting dynamics in a one-dimensional interacting Holstein model

Laser-Driven Multiferroics and Ultrafast Spin Current Generation

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