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
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Straight Photonic Nodal Lines with Quadrupole Berry Curvature Distribution and Superimaging "Fermi Arcs".
TL;DR: In this article , a photonic straight nodal line is proposed and demonstrated in a D 2D metacrystal, which is protected by an unusual rotoinversion time (roto-PT) symmetry.
Journal ArticleDOI
Disorder-Induced Quantum Phase Transitions in Three-Dimensional Second-Order Topological Insulators.
C. Wang,X. R. Wang +1 more
TL;DR: In this paper, a tight-binding Hamiltonian for non-interacting electrons on a cubic lattice with a reflection symmetry was proposed to support a 3DSOTI in the absence of disorder.
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Classical-to-Topological Transmission Line Couplers
TL;DR: In this paper, a transition from a classical metallic transmission line to a topologically nontrivial line wave emulating the quantum spin Hall effect is presented, where a zero-gap antipodal slot line is used as the starting transmission line, which is then coupled to the topological metasurface via a field matching procedure.
Journal Article
Synthetic gauge flux and Weyl points in acoustic systems.
TL;DR: In this paper, it was shown that inversion symmetry breaking can be used to create acoustic analogues of the topological Haldane model and an effective gauge flux in a reduced two-dimensional system by engineering interlayer couplings.
Journal ArticleDOI
Multipolar edge states in the anisotropic kagome antiferromagnet
TL;DR: In this paper, the topologically nontrivial multiplet excitations of the spin-$1/2$ kagome antiferromagnet with strong breathing anisotropy and Dzyaloshinskii-Moriya interaction were studied.
References
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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.
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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.
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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.
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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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.