Anomalous Topological Phases and Unpaired Dirac Cones in Photonic Floquet Topological Insulators

Daniel Leykam, M. C. Rechtsman, Y. D. Chong

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

We propose a class of photonic Floquet topological insulators based on staggered helical lattices and an efficient numerical method for calculating their Floquet band structure. The lattices support anomalous Floquet topological insulator phases with vanishing Chern number and tunable topological transitions. At the critical point of the topological transition, the band structure hosts a single unpaired Dirac cone, which yields a variety of unusual transport effects: a discrete analogue of conical diffraction, weak antilocalization not limited by intervalley scattering, and suppression of Anderson localization. Unlike previous designs, the effective gauge field strength can be controlled via lattice parameters such as the interhelix distance, significantly reducing radiative losses and enabling applications such as switchable topological waveguiding.

Original languageEnglish (US)
Article number013902
JournalPhysical review letters
Volume117
Issue number1
DOIs
StatePublished - Jun 29 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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