Photonic topological insulators
Alexander B. Khanikaev,S. Hossein Mousavi,Wang-Kong Tse,Mehdi Kargarian,Allan H. MacDonald,Gennady Shvets +5 more
TLDR
It is shown that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those identified for condensed-matter topological insulators.Abstract:
Recent progress in understanding the topological properties of condensed matter has led to the discovery of time-reversal-invariant topological insulators. A remarkable and useful property of these materials is that they support unidirectional spin-polarized propagation at their surfaces. Unfortunately topological insulators are rare among solid-state materials. Using suitably designed electromagnetic media (metamaterials) we theoretically demonstrate a photonic analogue of a topological insulator. We show that metacrystals-superlattices of metamaterials with judiciously designed properties-provide a platform for designing topologically non-trivial photonic states, similar to those that have been identified for condensed-matter topological insulators. The interfaces of the metacrystals support helical edge states that exhibit spin-polarized one-way propagation of photons, robust against disorder. Our results demonstrate the possibility of attaining one-way photon transport without application of external magnetic fields or breaking of time-reversal symmetry. Such spin-polarized one-way transport enables exotic spin-cloaked photon sources that do not obscure each other.read more
Citations
More filters
Journal ArticleDOI
Bifurcations of edge states—topologically protected and non-protected—in continuous 2D honeycomb structures
TL;DR: In this paper, the authors consider a family of Schrodinger Hamiltonians consisting of a bulk honeycomb potential and a perturbing edge potential, and show that the topologically protected edge state bifurcation is seeded by the zero-energy eigenstate of a one-dimensional Dirac operator.
Journal ArticleDOI
Inverse Design of Photonic Topological Insulators with Extra‐Wide Bandgaps
Journal ArticleDOI
Dynamically Controllable Terahertz Graphene Y-Circulator
Victor Dmitriev,Wagner Castro +1 more
TL;DR: In this paper, a three-port circulator for the terahertz (THz) region is proposed and analyzed theoretically, and the authors demonstrate the isolation greater than −15 dB and the insertion loss better then −3 dB within the bandwidth of about 7.4% and the central frequency of 5.38 THz.
Journal ArticleDOI
Robust and High-Capacity Phononic Communications through Topological Edge States by Discrete Degree-of-Freedom Multiplexing
TL;DR: In this article, the robust edge states along the interfaces between distinct topological classes are used to make progress, and these fault-tolerant edge channels are protected jointly by both pseudospin and valley degrees of freedom, naturally providing doubled information carriers within every channel, and may serve as a building block for large scale phononic circuits and networks.
Journal ArticleDOI
Analytic theory of an edge mode between impedance surfaces
TL;DR: In this article, an eigenmode analysis of the electromagnetic field which occurs between two complementary surface impedances is presented based on the generalized reflection method which is a generalization of the Sommerfeld-Maliuzhinets technique.
References
More filters
Journal ArticleDOI
Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
Journal ArticleDOI
Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
Journal ArticleDOI
Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
Journal ArticleDOI
The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
Journal ArticleDOI
Experimental Verification of a Negative Index of Refraction
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.