Photonic Anomalous Quantum Hall Effect

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Title
Photonic Anomalous Quantum Hall Effect
Author(s)
Mittal, S; Orre, VV; Leykam, D; Chong, YD; Hafezi, M
Publication Date
2019-07
Journal
PHYSICAL REVIEW LETTERS, v.123, no.4, pp.043201 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 American Physical Society.We experimentally realize a photonic analogue of the anomalous quantum Hall insulator using a two-dimensional (2D) array of coupled ring resonators. Similar to the Haldane model, our 2D array is translation invariant, has a zero net gauge flux threading the lattice, and exploits next-nearest neighbor couplings to achieve a topologically nontrivial band gap. Using direct imaging and on-chip transmission measurements, we show that the band gap hosts topologically robust edge states. We demonstrate a topological phase transition to a conventional insulator by frequency detuning the ring resonators and thereby breaking the inversion symmetry of the lattice. Furthermore, the clockwise or the counterclockwise circulation of photons in the ring resonators constitutes a pseudospin degree of freedom. The two pseudospins acquire opposite hopping phases, and their respective edge states propagate in opposite directions. These results are promising for the development of robust reconfigurable integrated nanophotonic devices for applications in classical and quantum information processing
URI
https://pr.ibs.re.kr/handle/8788114/6129
ISSN
0031-9007
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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