Chiral magnetic plasmons in anomalous relativistic matter

Gorbar, É. V.; Miransky, V. A.; Shovkovy, Igor; Sukhachov, P. O.

doi:10.1103/physrevb.95.115202

Cited by 38 publications

(29 citation statements)

References 74 publications

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“…The plasmon spectrum in a medium with a chiral asymmetry is studied in the literature in great details, for a recent discussion see [26,27]. Focusing on the long-wavelength limit we find that the leading correction to the plasmon spectrum, indeed, results in a similar phenomenon: the plasmon group velocity of a particular helicity can turn negative.…”

Section: Outlook and Discussionmentioning

confidence: 89%

Chiral anomalous dispersion

Sadofyev

Sen

2018

J. High Energ. Phys.

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Abstract:The linearized Einstein equation describing graviton propagation through a chiral medium appears to be helicity dependent. We analyze features of the corresponding spectrum in a collision-less regime above a flat background. In the long wave-length limit, circularly polarized metric perturbations travel with a helicity dependent group velocity that can turn negative giving rise to a new type of an anomalous dispersion. We further show that this chiral anomalous dispersion is a general feature of polarized modes propagating through chiral plasmas extending our result to the electromagnetic sector.

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Section: Outlook and Discussionmentioning

confidence: 89%

Chiral anomalous dispersion

Sadofyev

Sen

2018

J. High Energ. Phys.

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“…The effects caused by WSs' nontrivial topology manifest in the optical [55,62,[64][65][66][67][68][69][70][71] and electron density responses [72][73][74][75][76][77][78][79][80][81][82][83][84][85]. In particular, the AHE and CME give rise to gyrotropic terms in dielectric function [86], which lead to the Faraday and Kerr magneto-optical effects in T -broken WS [65,66] and to the natural optical activity in P-broken WSs [55,67,87].…”

Section: Introductionmentioning

confidence: 99%

Giant tunable nonreciprocity of light in Weyl semimetals

2018

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The propagation of light in Weyl semimetal films is analyzed. The magnetic family of these materials is known by anomalous Hall effect, which, being enhanced by the large Berry curvature, allows one to create strong gyrotropic and nonreciprocity effects without external magnetic field. The existence of nonreciprocal waveguide electromagnetic modes in ferromagnetic Weyl semimetal films in the Voigt configuration is predicted. Thanks to the strong dielectric response caused by the gapless Weyl spectrum and the large Berry curvature, ferromagnetic Weyl semimetals combine the best waveguide properties of magnetic dielectrics or semiconductors with strong anomalous Hall effect in ferromagnets. The magnitude of the nonreciprocity depends both on the internal Weyl semimetal properties, the separation of Weyl nodes, and the external factor, the optical contrast between the media surrounding the film. By tuning the Fermi level in Weyl semimetals, one can vary the operation frequencies of the waveguide modes in THz and mid-IR ranges. Our findings pave the way to the design of compact, tunable, and effective nonreciprocal optical elements. arXiv:1808.00342v3 [cond-mat.mes-hall]

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“…Additionally, novel collective excitations can emerge in the presence of a bulk pseudomagnetic field [114,115]. For instance, low energy gapless charge excitations known as helicons, which typically require the presence of magnetic fields, can exist as long as B 5 = 0 [115].…”

Section: F O L T J 5 Z D H 8 K F P 5 a Y H C J R K = < / L A T E X I mentioning

confidence: 99%

Pseudo-electromagnetic fields in 3D topological semimetals

2019

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Dirac and Weyl semimetals, materials where electrons behave as relativistic fermions, react to position-and time-dependent perturbations, such as strain, as if emergent electromagnetic fields were applied. Since they differ from external electromagnetic fields in their symmetries and phenomenology they are called pseudo-electromagnetic fields, and enable a simple and unified description of a variety of inhomogeneous systems involving topological semimetals. We review the different physical ways to create effective pseudo-fields, their observable consequences as well as their similarities and differences compared to electromagnetic fields. Among these difference is their effect on quantum anomalies, the absence of a classical symmetry in the quantum theory, which we revisit from a quantum field theory and a semiclassical viewpoint. We conclude with predicted observable signatures of the pseudo-fields and the nascent experimental status. * All authors contributed equally to the preparation of this review arXiv:1903.11088v1 [cond-mat.mes-hall]

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Chiral magnetic plasmons in anomalous relativistic matter

Cited by 38 publications

References 74 publications

Chiral anomalous dispersion

Chiral anomalous dispersion

Giant tunable nonreciprocity of light in Weyl semimetals

Pseudo-electromagnetic fields in 3D topological semimetals

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