Azimuthally unidirectional transport of energy in magnetoelectric fields: topological Lenz’s effect

Joffe, R.; Kamenetskii, E. O.; Shavit, R.

doi:10.1080/09500340.2017.1357853

Cited by 7 publications

(19 citation statements)

References 32 publications

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“…Nontrivial topology of MDM oscillations in such a sample manifests itself in unidirectionally rotating (chiral) eigenmodes. Breaking of symmetry between clockwise and counterclockwise modes due to the chiral boundary conditions results in appearance of MDM angular momenta and power‐flow vortices . We have unidirectionally rotating spin‐wave packet that carries an orbital angular momentum.…”

Section: Me Fields and Quasi‐magnetostatic Quantized Statesmentioning

confidence: 99%

“…This explains the picture of power flow rotations shown in Figure 3. The “source” of the helicity factor is the pseudoscalar quantity of the magnetization distribution in a ferrite disk at the MDM resonances:

\int_{V} \overset{m}{true} \cdot {false(\vec{\nabla} \times \vec{m} false)}^{*} d V \neq 0

V is a volume a ferrite sample. These magnetization parameters are distributed asymmetrically with respect to the z ‐axis (see Figure 4).…”

Section: Me Fields and Quasi‐magnetostatic Quantized Statesmentioning

confidence: 99%

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Electrodynamics of Magnetoelectric Media and Magnetoelectric Fields

Kamenetskii

2020

Annalen der Physik

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The relationship between magnetoelectricity and electromagnetism is a subject of a strong interest and numerous discussions in microwave and optical wave physics and material sciences. The definition of the energy and momentum of the electromagnetic (EM) field in a magnetoelectric (ME) medium is not a trivial problem. The question of whether electromagnetism and magnetoelectricity can coexist without an extension of Maxwell's theory arises when the effects of EM energy propagation are studied and the group velocity of the waves in an ME medium is considered. The energy balance equation reveals unusual topological structure of fields in ME materials. Together with certain constraints on the constitutive parameters of a medium, definite constraints on the local field structure should be imposed. Analyzing the EM phenomena inside an ME material, the question “what kind of the near fields arising from a sample of such a material can be measured?” should be answered. The visualization of the ME states requires an experimental technique that is based on an effective coupling to the violation of spatial as well as temporal inversion symmetry. To observe the ME energy in a subwavelength region, it is necessary to assume the existence of first‐principle near fields—the ME fields. These are non‐Maxwellian near fields with specific properties of violation of spatial and temporal inversion symmetry. A particular interest to the ME fields arises in studies of metamaterials with “artificial‐atoms” ME elements.

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Section: Me Fields and Quasi‐magnetostatic Quantized Statesmentioning

confidence: 99%

\int_{V} \overset{m}{true} \cdot {false(\vec{\nabla} \times \vec{m} false)}^{*} d V \neq 0

V is a volume a ferrite sample. These magnetization parameters are distributed asymmetrically with respect to the z ‐axis (see Figure 4).…”

Section: Me Fields and Quasi‐magnetostatic Quantized Statesmentioning

confidence: 99%

Electrodynamics of Magnetoelectric Media and Magnetoelectric Fields

Kamenetskii

2020

Annalen der Physik

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“…On a surface of a MDM ferrite disk, there are both the regions of the orbitally driven normal magnetic and normal electric fields. Moreover, the maximums (minimums) of the electric and magnetic fields normal to the disk are situated at the same places on the disk plane [36]. When a metal wall is placed closely to a ferrite-disk plane, this field structure is projected on the metal.…”

Section: Ss Hjmentioning

confidence: 99%

“…In Ref. [36] it was shown that due to the topological action of the azimuthally unidirectional transport of energy in a MDM-resonance ferrite sample there exists the opposite topological reaction (opposite azimuthally unidirectional transport of energy) on a metal screen placed near this sample. This effect is called topological Lenz's effect.…”

Section: Ss Hjmentioning

confidence: 99%

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Quantization of magnetoelectric fields

Kamenetskii

2019

Journal of Modern Optics

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The effect of quantum coherence involving macroscopic degree of freedom, and occurring in systems far larger than individual atoms are one of the topical fields in modern physics. Because of material dispersion, a phenomenological approach to macroscopic quantum electrodynamics, where no canonical formulation is attempted, is used. The problem becomes more complicated when geometrical forms of a material structure have to be taken into consideration. Magnetic-dipolar-mode (MDM) oscillations in a magnetically saturated quasi-2D ferrite disk are macroscopically quantized states. In this ferrimagnetic structure, long-range dipole-dipole correlation in positions of electron spins can be treated in terms of collective excitations of a system as a whole. The near fields in the proximity of a MDM ferrite disk have space and time symmetry breakings. Such MDM-originated fieldscalled magnetoelectric (ME) fieldscarry both spin and orbital angular momentums. By virtue of unique topology, ME fields are different from free-space electromagnetic (EM) fields. The ME fields are quantum fluctuations in vacuum. We call these quantized states ME photons. There are not virtual EM photons. We show that energy, spin and orbital angular momenta of MDM oscillations constitute the key physical quantities that characterize the ME-field configurations. We show that vacuum can induce a Casimir torque between a MDM ferrite disk, metal walls, and dielectric samples. PACS number(s): 41.20.Jb, 71.36.+c, 76.50.+g I.

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Quantized Orbital Angular Momentums of Dipolar Magnons and Magnetoelectric Cavity Polaritons

Kamenetskii

2024

Annalen der Physik

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Magnons are viewed as local deviations from the ordered state. Usually, the spin magnetic moment of magnons is considered. In a 3D‐confined structure of a magnetic insulator with magnetodipolar mode (MDM) oscillations, an orbital angular momentum (OAM) as well as a spin angular momentum (SAM) can be observed along a static magnetic field. In such a confined structure as quasi‐2D ferrite disk, energy levels of MDM oscillations are quantized. Quantum confinement is characterized by a half‐integer internal OAM, which is also associated with a circulating energy flow. The observation of MDM resonances in the 3D‐confined structure of a magnetic insulator is due to the interaction of two subsystems: ferromagnetic and electric polarization orders. The coupling states of these two concurrent orders, caused by OAMs, are considered as magnetoelectric (ME) states. The near fields of MDM resonators are characterized by simultaneous violation of time reversal and inversion symmetry. This plays a significant role in the problems of strong light‐matter interaction regime and quantum atmosphere. The analysis of SAM and OAM in 3D‐confined magnetic insulators becomes very important for the realization of ME meta‐atomic structures. Current interest lies in considering such artificial systems as subwavelength ME quantum emitters of electromagnetic radiation.

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Azimuthally unidirectional transport of energy in magnetoelectric fields: topological Lenz’s effect

Cited by 7 publications

References 32 publications

Electrodynamics of Magnetoelectric Media and Magnetoelectric Fields

Electrodynamics of Magnetoelectric Media and Magnetoelectric Fields

Quantization of magnetoelectric fields

Quantized Orbital Angular Momentums of Dipolar Magnons and Magnetoelectric Cavity Polaritons

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