Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices

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Title
Reconfigurable Topological Phases in Next-Nearest-Neighbor Coupled Resonator Lattices
Author(s)
Leykam, Daniel; S. Mittal; M. Hafezi; Y. D. Chong
Publication Date
2018-07
Journal
PHYSICAL REVIEW LETTERS, v.121, no.2, pp.023901 -
Publisher
AMER PHYSICAL SOC
Abstract
We present a reconfigurable topological photonic system consisting of a 2D lattice of coupled ring resonators, with two sublattices of site rings coupled by link rings, which can be accurately described by a tight-binding model. Unlike previous coupled-ring topological models, the design is translationally invariant, similar to the Haldane model, and the nontrivial topology is a result of next-nearest couplings with nonzero staggered phases. The system exhibits a topological phase transition between trivial and spin Chern insulator phases when the sublattices are frequency detuned. Such topological phase transitions can be easily induced by thermal or electro-optic modulators, or nonlinear cross phase modulation. We use this lattice to design reconfigurable topological waveguides, with potential applications in on-chip photon routing and switching.© 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/4948
ISSN
0031-9007
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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