Non-Hermiticity-induced flat band

Non-Hermiticity-induced flat band We demonstrate the emergence of an entire flat band with no complex component embedded in dispersive bands at the exceptional point of a PT-symmetric photonic lattice. For this to occur, the gain and loss parameter effectively alters the size of the partial flat band windows and band gap of the photonic lattice simultaneously. The mode associated with the entire flat band is robust against changes in the system size and survives even at the edge of the lattice. Our proposal offers a route for controllable localization of light in non-Hermitian systems and a technique for measuring non-Hermiticity via localization. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Non-Hermiticity-induced flat band

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Non-Hermiticity-induced flat band

Abstract

We demonstrate the emergence of an entire flat band with no complex component embedded in dispersive bands at the exceptional point of a PT-symmetric photonic lattice. For this to occur, the gain and loss parameter effectively alters the size of the partial flat band windows and band gap of the photonic lattice simultaneously. The mode associated with the entire flat band is robust against changes in the system size and survives even at the edge of the lattice. Our proposal offers a route for controllable localization of light in non-Hermitian systems and a technique for measuring non-Hermiticity via localization.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1050-2947
eISSN
1094-1622
D.O.I.
10.1103/PhysRevA.96.011802
Publisher site
See Article on Publisher Site

Abstract

We demonstrate the emergence of an entire flat band with no complex component embedded in dispersive bands at the exceptional point of a PT-symmetric photonic lattice. For this to occur, the gain and loss parameter effectively alters the size of the partial flat band windows and band gap of the photonic lattice simultaneously. The mode associated with the entire flat band is robust against changes in the system size and survives even at the edge of the lattice. Our proposal offers a route for controllable localization of light in non-Hermitian systems and a technique for measuring non-Hermiticity via localization.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Jul 5, 2017

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