Crossing and anti-crossing effects of polaritons in a magnetic-semiconductor superlattice influenced by an external magnetic field

Tuz, Vladimir R.; Fesenko, Volodymyr I.; Fedorin, Illia V.; Sun, Hong‐Bo; Shulga, V. M.

doi:10.1016/j.spmi.2017.01.040

Cited by 19 publications

(15 citation statements)

References 35 publications

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“…It is obvious that combining gyroelectric and gyromagnetic materials into a single gyroelectromagnetic system can bring many unique dispersion features, which are unattainable in separate subsystems. [36][37][38][39][40][41][42][43] In particular, in the present paper, we demonstrate that in a biaxial gyrotropic medium composed of magnetized ferrite and semiconductor layers, some specific distortions of isofrequency surfaces may occur. These distortions manifest themselves near the frequency of ferromagnetic resonance, where the magnetic subsystem possesses the properties of natural hyperbolic dispersion.…”

Section: Introductionsupporting

confidence: 58%

Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media

Tuz,

Fesenko

2020

Preprint

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Section: Introductionsupporting

confidence: 58%

Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media

Tuz,

Fesenko

2020

Preprint

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“…(1b) changes its sign. The state µ v = ε v = 0 is considered as a crossing point between these two parameters combinations [32,[39][40][41] (in literature this effect is also known as the mode crossing/anti-crossing effect [42,43]). In the bottom part of Fig.…”

Section: Superlattice Description and Dispersion Relationsmentioning

confidence: 99%

Coexistence of bulk and surface polaritons in a magnetic-semiconductor superlattice influenced by a transverse magnetic field

Tuz

Fesenko

Fedorin

et al. 2017

Journal of Applied Physics

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It is demonstrated that the effect of coexistence of bulk and surface polaritons within the same frequency band and wavevector space can be achieved in a magnetic-semiconductor superlattice providing a conscious choice of characteristic resonant frequencies and material fractions of the structure's underlying components as well as geometry of the external static magnetic field. The study is based on the effective medium theory which is involved to calculate dispersion characteristics of the long-wavelength electromagnetic modes of ordinary and extraordinary bulk polaritons and hybrid EH and HE surface polaritons derived via averaged expressions with respect to the effective constitutive parameters of the superlattice.

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“…On the other hand, the fact that hyperbolicity requires plasma behavior in a certain direction of wavevector space and insulating behavior in the others leads to an option instead of metals along with dielectrics use some combination of semiconductors and magnetic materials (e.g., ferrites) as building blocks of the hyperbolic metamaterials [19]. This possibility becomes even more attractive considering that influence of an external magnetic field to such magneto-active structures allows to gain a control over waves dispersion features [20][21][22], nonreciprocal effect [23,24], and on their topological transitions [25,26]. Such systems are important for a number of practical applications in integrated photonic devices for telecommunications (see, for instance, [27] and references therein).…”

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confidence: 99%

Bi-hyperbolic isofrequency surface in a magnetic-semiconductor superlattice

2017

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The topology of isofrequency surfaces of a magnetic-semiconductor superlattice influenced by an external static magnetic field is studied. In particular, in the given structure, topology transitions from standard closed forms of spheres and ellipsoids to open ones of Type I and Type II hyperboloids as well as bi-hyperboloids were revealed and analyzed. In the latter case, it is found out that a complex of an ellipsoid and bi-hyperboloid in isofrequency surfaces appears as a simultaneous effect of both the ratio between magnetic and semiconductor filling factors and magnetic field influence. It is proposed to consider the obtained bi-hyperbolic isofrequency surface as a new topology class of the wave dispersion.A topology of photonic systems is related to global behaviors of a wave function accounting constitutive and structural parameters in the entire dispersion band [1]. It means that in the phase space of a propagating electromagnetic wave at a constant frequency the topology appears in the form of an isofrequency surface (also known as Fresnel wave surface or surface of wave vectors), which governs the wave propagation conditions along an arbitrary direction inside the corresponding optical material (in fact it expresses the relationships between the directions of the wave vector and the vector of group or phase velocity of the wave; for the first reading on construction of isofrequency surfaces according to the laws of geometrical optics we refer to methodological notes in [2]). By definition, each isofrequency surface belongs to a class of quadrics [3], from a large variety of which three particular nondegenerated forms are well known in optics-sphere, ellipsoid and hyperboloid.Thus, in an isotropic medium isofrequency surfaces appear in the closed form of a sphere, whereas in a uniaxial optical crystal they transit to a complex of a sphere and spheroid, which characterize propagation conditions of ordinary and extraordinary waves, respectively [4]. These isofrequency surfaces can intersect each other in some sections at certain singular points. In a biaxial crystal the complex consists of a sphere and ellipsoid. In other natural anisotropic media including acoustic crystals, plasmas and magnetically ordered (gyrotropic) media isofrequency surfaces can acquire both closed and open forms. In the latter case they resemble the form of a hyperboloid (see Fig. 8.3.2 in [5] for a taxonomy of isofrequency surfaces in anisotropic media). In this way, different forms of topology of the wave dispersion express the kind of anisotropy, namely the relations be- * volodymyr.i.fesenko@gmail.com tween components of permittivity and/or permeability tensors characterizing the medium.Indeed, in an anisotropic crystal when all principal values of its permittivity tensor are positive (i.e., ε > 0 and ε ⊥ > 0), the isofrequency surfaces have closed forms [ Fig. 1(a)]. Contrariwise, when one or two corresponding tensor's components are negative (i.e., the medium is "extremely" anisotropic), the topology appears in the open form ...

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Crossing and anti-crossing effects of polaritons in a magnetic-semiconductor superlattice influenced by an external magnetic field

Cited by 19 publications

References 35 publications

Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media

Magnetically induced topological transitions of hyperbolic dispersion in biaxial gyrotropic media

Coexistence of bulk and surface polaritons in a magnetic-semiconductor superlattice influenced by a transverse magnetic field

Bi-hyperbolic isofrequency surface in a magnetic-semiconductor superlattice

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