Photonic Floquet topological insulators
Mikael C. Rechtsman,Julia M. Zeuner,Yonatan Plotnik,Yaakov Lumer,Daniel K. Podolsky,Felix Dreisow,Stefan Nolte,Mordechai Segev,Alexander Szameit +8 more
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TLDR
This work proposes and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport—a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges.Abstract:
Topological insulators are a new phase of matter, with the striking property that conduction of electrons occurs only on their surfaces. In two dimensions, electrons on the surface of a topological insulator are not scattered despite defects and disorder, providing robustness akin to that of superconductors. Topological insulators are predicted to have wide-ranging applications in fault-tolerant quantum computing and spintronics. Substantial effort has been directed towards realizing topological insulators for electromagnetic waves. One-dimensional systems with topological edge states have been demonstrated, but these states are zero-dimensional and therefore exhibit no transport properties. Topological protection of microwaves has been observed using a mechanism similar to the quantum Hall effect, by placing a gyromagnetic photonic crystal in an external magnetic field. But because magnetic effects are very weak at optical frequencies, realizing photonic topological insulators with scatter-free edge states requires a fundamentally different mechanism-one that is free of magnetic fields. A number of proposals for photonic topological transport have been put forward recently. One suggested temporal modulation of a photonic crystal, thus breaking time-reversal symmetry and inducing one-way edge states. This is in the spirit of the proposed Floquet topological insulators, in which temporal variations in solid-state systems induce topological edge states. Here we propose and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport-a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges. Our system is composed of an array of evanescently coupled helical waveguides arranged in a graphene-like honeycomb lattice. Paraxial diffraction of light is described by a Schrodinger equation where the propagation coordinate (z) acts as 'time'. Thus the helicity of the waveguides breaks z-reversal symmetry as proposed for Floquet topological insulators. This structure results in one-way edge states that are topologically protected from scattering.read more
Citations
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Measuring topological invariants in small photonic lattices
TL;DR: In this article, a robust practical scheme for measuring the topological invariants of non-interacting tight-binding models realized in arrays of coupled photonic cavities is presented.
Journal ArticleDOI
General description for nonequilibrium steady states in periodically driven dissipative quantum systems
Tatsuhiko N. Ikeda,Masahiro Sato +1 more
TL;DR: In this article, the general description for nonequilibrium steady states (NESS) in periodically driven dissipative systems was derived by focusing on the systems under high-frequency drive and time-independent Lindblad-type dissipation with the detailed balance condition.
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Pseudospin-induced chirality with staggered optical graphene
TL;DR: In this article, Zhang et al. showed that in an optical analog of staggered graphene, a photonic honeycomb lattice waveguide with in-plane inversion symmetry breaking, the pseudospin mode can strongly couple to the spin of an optical beam that is incident in certain directions.
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Spatiotemporal plane wave expansion method for arbitrary space-time periodic photonic media.
Jagang Park,Bumki Min +1 more
TL;DR: In this paper, the authors derived a systematic method to calculate the photonic band structures and mode field profiles of arbitrary space-time periodic media by adopting the plane wave expansion method and extending to the spacetime domain.
Journal ArticleDOI
Experimental observation of topological Z2 exciton-polaritons in transition metal dichalcogenide monolayers.
Mengyao Li,Mengyao Li,Ivan S. Sinev,F. A. Benimetskiy,T. Ivanova,Ekaterina Khestanova,Svetlana Kiriushechkina,Anton Vakulenko,Sriram Guddala,M. S. Skolnick,M. S. Skolnick,Vinod M. Menon,Vinod M. Menon,D. N. Krizhanovskii,D. N. Krizhanovskii,Andrea Alù,Andrea Alù,Anton Samusev,Alexander B. Khanikaev,Alexander B. Khanikaev +19 more
TL;DR: In this paper, the authors explore polaritonic metasurfaces based on 2D transition metal dichalcogenides (TMDs) as a promising platform for topological polaritonics.
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