Unidirectional and diffractionless surface plasmon polaritons on three-dimensional nonreciprocal plasmonic platforms

Gangaraj, S. Ali Hassani; Hanson, George W.; Silveirinha, Mário G.; Shastri, Kunal; Antezza, Mauro; Monticone, Francesco

doi:10.1103/physrevb.99.245414

Cited by 46 publications

(13 citation statements)

References 49 publications

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“…This regime has been studied in detail in Refs. [33][34][35]. If the bias is turned off, ω c = 0, the system becomes reciprocal, the two Weyl points annihilate each other at k z = 0, and the Weyl material undergoes a topological phase transition to a trivial state.…”

Section: Nonreciprocal Implementationmentioning

confidence: 99%

Dissipation-induced topological transitions in continuous Weyl materials

Shastri

Monticone

2020

Phys. Rev. Research

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Many topologically nontrivial systems have been recently realized using electromagnetic, acoustic, and other classical wave-based platforms. As the simplest class of three-dimensional topological systems, Weyl semimetals have attracted significant attention in this context. However, the robustness of the topological Weyl state in the presence of dissipation, which is common to most classical realizations, has not been studied in detail. In this paper we demonstrate that the symmetry properties of the Weyl material play a crucial role in the annihilation of topological charges in the presence of losses. We consider the specific example of a continuous plasma medium and compare two possible realizations of a Weyl-point dispersion based on breaking time-reversal symmetry (reciprocity) or breaking inversion symmetry. We theoretically show that the topological state is fundamentally more robust against losses in the nonreciprocal realization. Our findings elucidate the impact of dissipation on three-dimensional topological materials and metamaterials.

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Section: Nonreciprocal Implementationmentioning

confidence: 99%

Dissipation-induced topological transitions in continuous Weyl materials

Shastri

Monticone

2020

Phys. Rev. Research

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“…They may enable multiple striking topological features such as Majorana type edge states and zero mode 22 , which do not exist in inversion symmetry breaking systems. Although there have been theoretical proposals on implementation of Weyl degeneracies by applying external magnetic fields on finely designed photonic crystals 16,31 , very few of them are easily realizable in experiment due to the challenge in three-dimensional structuring of magnetic materials 32,33 . Interestingly, it was recently theoretically proposed that plasma, the fourth fundamental state of natural matter 34,35 , can support Weyl degeneracies under external magnetic fields 19 , as well as nonreciprocal wave transport [36][37][38] . Since there is no structuring involved, this represents a facile and tunable approach for achieving photonic Weyl degeneracies arising from time-reversal symmetry breaking.…”

Section: Photonic Weyl Points Due To Broken Time-reversal Symmetry Inmentioning

confidence: 99%

Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor

et al. 2019

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“…Finally, within the unidirectional window, we see from Figure 5b that the equifrequency contours become open and no backward-propagating mode exist in the −x direction, at least in the local case [58] (in the nonlocal case, the equifrequency contours close for very large values of wavevector). Furthermore, due to the hyperbolic-like shape of the equifrequency contours, a point source near the surface would launch SPPs propagating as narrow diffraction-less beams [59]. This is because the asymptotic part of the equifrequency contours tend to dominate the response, resulting in highly collimated energy flow (group velocity vectors are normal to the equifrequency contour), as shown in Figure 5c.…”

Section: Surface States-transparent Opaque and Other Interfacesmentioning

confidence: 99%

“…For additional details on this interesting behavior, analogous to diffractionless wave propagation in hyperbolic metamaterials, but with the additional benefit of quasi-unidirectionality, we refer the interested readers to Ref. [59].…”

Section: Surface States-transparent Opaque and Other Interfacesmentioning

confidence: 99%

Nonreciprocal and Topological Plasmonics

Shastri¹,

Abdelrahman²,

Monticone³

2021

Photonics

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Metals, semiconductors, metamaterials, and various two-dimensional materials with plasmonic dispersion exhibit numerous exotic physical effects in the presence of an external bias, for example an external static magnetic field or electric current. These physical phenomena range from Faraday rotation of light propagating in the bulk to strong confinement and directionality of guided modes on the surface and are a consequence of the breaking of Lorentz reciprocity in these systems. The recent introduction of relevant concepts of topological physics, translated from condensed-matter systems to photonics, has not only given a new perspective on some of these topics by relating certain bulk properties of plasmonic media to the surface phenomena, but has also led to the discovery of new regimes of truly unidirectional, backscattering-immune, surface-wave propagation. In this article, we briefly review the concepts of nonreciprocity and topology and describe their manifestation in plasmonic materials. Furthermore, we use these concepts to classify and discuss the different classes of guided surface modes existing on the interfaces of various plasmonic systems.

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Unidirectional and diffractionless surface plasmon polaritons on three-dimensional nonreciprocal plasmonic platforms

Cited by 46 publications

References 49 publications

Dissipation-induced topological transitions in continuous Weyl materials

Dissipation-induced topological transitions in continuous Weyl materials

Photonic Weyl points due to broken time-reversal symmetry in magnetized semiconductor

Nonreciprocal and Topological Plasmonics

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