Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A17: Defects in Topological Materials
8:00 AM–11:00 AM,
Monday, March 4, 2024
Room: M100H
Sponsoring
Unit:
DCMP
Chair: Abdullah AlShuaibi, Cornell University
Abstract: A17.00014 : Topological Broadband Receiver Protectors Based on High-Order Degeneracies Enabled by Hidden Symmetries*
10:36 AM–10:48 AM
Presenter:
William A Tuxbury
(Wesleyan)
Author:
William A Tuxbury
(Wesleyan)
Since then, a theory of reflectionless scattering modes (RSMs) has been developed. RSMs are eigenfunctions of a wave operator that describes an auxiliary system. When an RSM is excited at the appropriate eigenfrequency, no power will be reflected at the input ports. When multiple RSMs degenerate, they enforce an anomalous broadened resonance line shape.
We have theoretically constructed a class of one-dimensional coupled resonator microwave waveguides by coupling two single-defect SSH chains; one of which is nonlinear. For low incident powers, the associated auxiliary RSM operator simultaneously respects an anti-linear symmetry and an anti-linear anti-symmetry. Together, these symmetries impose strong constraints on the RSMs, enabling them to display an exceptional point degeneracy of order 6th and results in an experimentally observable transmission bandwidth broadening. For high incident powers, the nonlinear mechanism kicks in, leading to a self-induced violation of these symmetries and a suppression of the transmittance.
*NSF-ECCS-2148318 andSimons Foundation for Collaboration in MPS number 733698
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