Effect of local periodic perturbations on the topological edge mode of the SSH-model (Conference Presentation)

Zlata Cherpakova; Stefan Linden

doi:10.1117/12.2507865

4 March 2019 Effect of local periodic perturbations on the topological edge mode of the SSH-model (Conference Presentation)

Zlata Cherpakova, Stefan Linden

Author Affiliations +

Proceedings Volume 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII; 109330T (2019) https://doi.org/10.1117/12.2507865
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Topological edge states draw their unique robustness against perturbations from a topological invariant of the bulk of the system. As long as the topological properties persist, the edge transport is not perturbed by static defects, which is referred to as the bulk-edge correspondence. In our work we demonstrate that local periodic perturbations of the interface can destroy the topological protection even if the bulk of the system stays unperturbed. As model system we consider the Su-Schrieffer-Heeger (SSH) model realized in coupled plasmonic waveguide arrays with alternating short and long separations. Interfacing two SSH chains with different dimerizations we induce the topological edge mode. The temporal perturbations are realized by periodically bending the waveguide at the interface. The spatial evolution of surface plasmon polaritons (SPPs) in the array is monitored by real- and Fourier space leakage radiation microscopy. In Fourier space we observe that time-periodic perturbations of the interface create Floquet replicas of the topological edge mode. If the driving frequency is in the range for which the first Floquet replicas cross the static bands, the topological edge state couples to bulk states and the topological protection is destroyed resulting in delocalization of SPPs in real space. Otherwise the topological protection is conserved and SPPs stay localized at the interface. Our experimental findings are in full agreement with the theoretical analysis based on Floquet theory and illuminates the generalization of the bulk-edge correspondence for Floquet systems for the special case of a static bulk.

Conference Presentation

Citation Download Citation

Zlata Cherpakova and Stefan Linden "Effect of local periodic perturbations on the topological edge mode of the SSH-model (Conference Presentation)", Proc. SPIE 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII, 109330T (4 March 2019); https://doi.org/10.1117/12.2507865

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Interfaces

Microscopy

Plasmonic waveguides

Surface plasmon polaritons

Systems modeling

Waveguides

Keywords/Phrases

Search In:

Publication Years