Bulk and edge-state arcs in non-Hermitian coupled-resonator arrays
File(s)PhysRevA.98.033807.pdf (1.55 MB)
Published version
Author(s)
Malzard, Simon
Schomerus, Henning
Type
Journal Article
Abstract
We describe the formation of bulk and edge arcs in the dispersion relation of two-dimensional coupled-resonator arrays that are topologically trivial in the Hermitian limit. Each resonator provides two asymmetrically coupled internal modes, as realized in noncircular open geometries, which enables the system to exhibit non-Hermitian physics. Neighboring resonators are coupled chirally to induce non-Hermitian symmetries. The bulk dispersion displays Fermi arcs connecting spectral singularities known as exceptional points and can be tuned to display purely real and imaginary branches. At an interface between resonators of different shape, one-dimensional edge states form that spectrally align along complex arcs connecting different parts of the bulk bands. We also describe conditions under which the edge-state arcs are freestanding. These features can be controlled via anisotropy in the resonator couplings.
Date Issued
2018-09-07
Date Acceptance
2018-09-01
Citation
Physical Review A, 2018, 98 (3)
ISSN
2469-9926
Publisher
American Physical Society
Journal / Book Title
Physical Review A
Volume
98
Issue
3
Copyright Statement
© 2018 American Physical Society.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000443951200005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Optics
Physics, Atomic, Molecular & Chemical
Physics
REAL SPECTRA
FERMI ARC
HAMILTONIANS
SYMMETRY
PHYSICS
POINTS
PHASE
Publication Status
Published
Article Number
033807