Photonic topological insulators.

Recent progress in understanding the topological pr operties of condensed matter has led to the discove ry of time-reversal invariant topological insulators. Because of limitations imposed by nature, topologi cally non-trivial electronic order seems to be uncommon e xcept in small-band-gap semiconductors with strong spin-orbit interactions. In this Article we show t ha artificial electromagnetic structures, known as metamaterials, provide an attractive platform for d esigning photonic analogues of topological insulato rs. We demonstrate that a judicious choice of the metam a erial parameters can create photonic phases that support a pair of helical edge states, and that the se edge states enable one-way photonic transport th at is robust against disorder.

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