Surge of power transmission in flat and nearly flat band lattices.
Phys Rev E
; 108(5): L052201, 2023 Nov.
Article
en En
| MEDLINE
| ID: mdl-38115488
ABSTRACT
Flat band systems can yield interesting phenomena, such as dispersion suppression of waves with frequency at the band. While linear transport vanishes, the corresponding nonlinear case is still an open question. Here, we study power transmission along nonlinear sawtooth lattices due to waves with the flat band frequency injected at one end. While there is no power transfer for small intensity, there is a threshold amplitude above which a surge of power transmission occurs, i.e., supratransmission, for defocusing nonlinearity. This is due to a nonlinear evanescent wave with the flat band frequency that becomes unstable. We show that dispersion suppression and supratransmission also exist even when the band is nearly flat.
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1
Colección:
01-internacional
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev E
Año:
2023
Tipo del documento:
Article
País de afiliación:
Emiratos Árabes Unidos