Helical transport in coupled resonator waveguides

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Title
Helical transport in coupled resonator waveguides
Author(s)
JungYun Han; Clemens Gneiting; Leykam, D
Publication Date
2019-06
Journal
PHYSICAL REVIEW B, v.99, no.22, pp.224201 -
Publisher
AMER PHYSICAL SOC
Abstract
© 2019 American Physical Society.We show that a synthetic pseudospin-momentum coupling can be used to design quasi-one-dimensional disorder-resistant coupled resonator optical waveguides (CROWs). In this structure, the propagating Bloch waves exhibit a pseudospin-momentum locking at specific momenta where backscattering is suppressed. We quantify this resistance to disorder using two methods. First, we calculate the Anderson localization length ζ, obtaining an order of magnitude enhancement compared to conventional CROWs for typical device parameters. Second, we study propagation in the time domain, finding that the loss of wave packet purity in the presence of disorder rapidly saturates, indicating the preservation of phase information before the onset of Anderson localization. Our approach of directly optimizing the bulk Bloch waves is a promising alternative to disorder-robust transport based on higher dimensional topological edge states
URI
https://pr.ibs.re.kr/handle/8788114/6166
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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