Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations

Sirenko, A. A.; Maršík, Přemysl; Bernhard, C.; Stanislavchuk, T. N.; Kiryukhin, V.; Cheong, S.-W.

doi:10.1103/physrevlett.122.237401

Cited by 71 publications

(51 citation statements)

References 42 publications

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“…The standard magnetic circular dichroism with circularlypolarized light in a transmission mode in ferro-(ferri)magnets corresponds to the angularmomentum-sign dependence in the specimen constituent with M [44]. This angular-momentumsign dependence has been also observed for THz vortex beam with orbital angular momentum propagating in the film of ferrimagnetic Tb3Fe5O12 garnet [43]. Note that ferro-rotation, which does not break space inversion, does not induce optical activity, but the ferro-rotation with external electric fields has SOS with a structural chirality, and thus induces reciprocal optical activity that is linearly proportional to external electric fieldsthe so-called linear electro-gyration [45].…”

Section: Nonreciprocity With Angular Momentummentioning

confidence: 63%

“…In terms of symmetry, there is no difference between spin angular momentum and orbital angular momentum. The nonreciprocity of a vortex light beam with orbital angular momentum has been, for the first time, observed for THz vortex beam propagating in ferrimagnetic Tb3Fe5O12 garnet [43]. The motion of an object with angular momentum along one direction can be linked with that in the opposite direction through {R,IM,T}, and M has broken {R,IM,T}, so M can induce nonreciprocal effect with angular momentum.…”

Section: Nonreciprocity With Angular Momentummentioning

confidence: 93%

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SOS: symmetry-operational similarity

Cheong

2019

npj Quantum Mater.

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Symmetry often governs condensed matter physics. The act of breaking symmetry spontaneously leads to phase transitions, and various observables or observable physical phenomena can be directly associated with broken symmetries. Examples include ferroelectric polarization, ferromagnetic magnetization, optical activities (including Faraday and magneto-optic Kerr rotations), second harmonic generation, photogalvanic effects, nonreciprocity, various Hall-effect-type transport properties, and multiferroicity. Herein, we propose that observable physical phenomena can occur when specimen constituents (i.e., lattice distortions or spin arrangements, in external fields or other environments, etc.) and measuring probes/quantities (i.e., propagating light, electrons or other particles in various polarization states, including vortex beams of light and electrons, bulk polarization or magnetization, etc.) share symmetry operational similarity (SOS) in relation to broken symmetries. In addition, quasi-equilibrium electronic transport processes such as diode-type transport effects, linear or circular photogalvanic effects, Hall-effect-type transport properties ((planar) Hall, Ettingshausen, Nernst, thermal Hall, spin Hall, and spin Nernst effects) can be understood in terms of symmetry operational systematics. The power of the SOS approach lies in providing simple and physically transparent views of otherwise unintuitive phenomena in complex materials. In turn, this approach can be leveraged to identify new materials that exhibit potentially desired properties as well as new phenomena in known materials.will limit our discussion to the central, often one-dimensional (1D), cases that are pictorially succinct and intuitive, applicable to numerous different materials, and most relevant to observables or observable physical phenomena.When the motion of an object in one direction is different from that in the opposite direction, it is called a nonreciprocal directional dichroism or simply a nonreciprocal effect [7][8][9]. The object can be an electron, a phonon, spin wave, or light in crystalline solids, and the best known example is that of nonreciprocal charge transport (i.e., diode) effects in p-n junctions, where a built-in electric field (E) breaks the directional symmetry [10]. The polarization (P) of ferroelectrics such as BiFeO3 or polar semiconductors such as BiTeBr can also act like the built-in electric field, so bulk diode (and photovoltaic) effects can be realized in these materials [11,12]. Certainly, both E and P are polar vectors, and behave identical under various symmetry operationssimilar with the identical behavior of magnetic field (H) and magnetization (M). In addition to p-n junctions, numerous technological devices such as optical isolators, spin current diodes or metamaterials do utilize nonreciprocal effects.Multiferroics, where ferroelectric and magnetic orders coexist, has attracted an enormous attention in recent years because of the cross-coupling effects between magnetism and ferroelectricity, and the ...

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Section: Nonreciprocity With Angular Momentummentioning

confidence: 63%

Section: Nonreciprocity With Angular Momentummentioning

confidence: 93%

SOS: symmetry-operational similarity

Cheong

2019

npj Quantum Mater.

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“…Also, although there is an emerging understanding of the IFE coupling of the SAM of a beam to the electron spin, a similar understanding of the interaction of OAM with spin or orbital magnetism has still to be established. Recently, a first observation of interaction of magnetism and an OAM vortex beam in the THz regime was reported [244]. It can already be perceived that taking both spin and orbital degrees of freedom of photonic beams into account will become paramount for the future development of magnetophotonics.…”

Section: Opto-magnetism: Towards An Ultrafast Control Of Magnetismentioning

confidence: 99%

Nanoscale magnetophotonics

Maccaferri

Zubritskaya

Razdolski

et al. 2020

Journal of Applied Physics

120

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This Perspective surveys the state-of-the-art and future prospects of science and technology employing the nanoconfined light (nanophotonics and nanoplasmonics) in combination with magnetism. We denote this field broadly as nanoscale magnetophotonics. We include a general introduction to the field and describe the emerging magneto-optical effects in magnetoplasmonic and magnetophotonic nanostructures supporting localized and propagating plasmons. Special attention is given to magnetoplasmonic crystals with transverse magnetization and the associated nanophotonic non-reciprocal effects, and to magneto-optical effects in periodic arrays of nanostructures. We give also an overview of the applications of these systems in biological and chemical sensing, as well as in light polarization and phase control. We further review the area of nonlinear magnetophotonics, the semiconductor spin-plasmonics, and the general principles and applications of opto-magnetism and nano-optical ultrafast control of magnetism and spintronics.

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“…in order to estimate the relaxation-time dependence of the (Color online) Schematic figure of the magnon dispersion for the 3D model in Eq (30)…”

mentioning

confidence: 99%

Theory for shift current of bosons: Photogalvanic spin current in ferrimagnetic and antiferromagnetic insulators

Ishizuka

Sato

2019

Phys. Rev. B

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We theoretically study the optical generation of dc spin current (i.e., a spin-current solar cell) in ordered antiferromagnetic and ferrimagnetic insulators, motivated by a recent study on the laserdriven spinon spin current in noncentrosymmetric quantum spin chains [H. Ishizuka and M. Sato, Phys. Rev. Lett. 122, 197702 (2019)]. Using a non-linear response theory for magnons, we analyze the dc spin current generated by a linearly-polarized electromagnetic wave (typically, terahertz or gigahertz waves). Considering noncentrosymmetric two-sublattice magnets as an example, we find a finite dc spin current conductivity at T = 0, where no thermally-excited magnons exist; this is in contrast to the case of the spinon spin current, in which the optical transition of the Fermi degenerate spinons plays an essential role. We find that the dc spin-current conductivity is insensitive to the Gilbert damping, i.e., it may be viewed as a shift current carried by bosonic particles (magnons). Our estimate shows that an electric-field intensity of E ∼ 10 4 − 10 6 V/cm is sufficient for an observable spin current. Our theory indicates that the linearly-polarized electromagnetic wave generally produces a dc spin current in noncentrosymmetric magnetic insulators. arXiv:1907.02734v1 [cond-mat.mes-hall]

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Terahertz Vortex Beam as a Spectroscopic Probe of Magnetic Excitations

Cited by 71 publications

References 42 publications

SOS: symmetry-operational similarity

SOS: symmetry-operational similarity

Nanoscale magnetophotonics

Theory for shift current of bosons: Photogalvanic spin current in ferrimagnetic and antiferromagnetic insulators

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