Helical transport in coupled resonator waveguides
| Autor: | Clemens Gneiting, JungYun Han, Daniel Leykam |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quantum Physics Anderson localization Condensed matter physics Wave packet Phase (waves) FOS: Physical sciences Disordered Systems and Neural Networks (cond-mat.dis-nn) 02 engineering and technology Condensed Matter - Disordered Systems and Neural Networks 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Resonator 0103 physical sciences Time domain Quantum Physics (quant-ph) 010306 general physics 0210 nano-technology Order of magnitude Optics (physics.optics) Physics - Optics Bloch wave |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.224201 |
| Popis: | We show that a synthetic pseudospin-momentum coupling can be used to design quasi-one-dimensional disorder-resistant coupled resonator optical waveguides (CROW). 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 $\xi$, obtaining an order of magnitude enhancement compared to a conventional CROW for typical device parameters. Second, we study propagation in the time domain, finding that the loss of wavepacket 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. Comment: 14 pages, 8 figures |
| Databáze: | OpenAIRE |
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