2025-03-27 スイス連邦工科大学ローザンヌ校(EPFL)
＜関連情報＞
- https://actu.epfl.ch/news/listen-to-quantum-atoms-talk-together-thanks-to-ac/
- https://journals.aps.org/prb/abstract/10.1103/PhysRevB.111.125156
エネルギーガイドのための振幅駆動型非反復性の観測 Observation of amplitude-driven nonreciprocity for energy guiding
Mathieu Padlewski, Romain Fleury, and Hervé Lissek
Physical Review B Published 25 March, 2025
DOI:https://doi.org/10.1103/PhysRevB.111.125156
Abstract
The non-Hermitian skin effect is an intriguing physical phenomenon, in which all eigenmodes of a non-Hermitian lattice become localized at boundary regions. While such an exotic behavior has been demonstrated in various physical platforms, most realizations have been so far restricted to the linear regime. Here, we explore the cooperation between nonlinearity and the non-Hermitian skin effect, revealing extraordinary amplitude-driven skin localization dynamics. By introducing an extension to the Hatano-Nelson model where couplings inherit nonlinear behavior, we demonstrate the existence of unique amplitude-driven non-Hermitian skin modes capable of concentrating the energy of a source at any point of space, depending on the power level. Our theoretical model is supported by numerical simulations and experimental realization via a highly configurable acoustic metamaterial composed of active electroacoustic resonators. In all, our findings open up exciting paths for a new generation of nonreciprocal systems, in which nonlinearities serve as a strategic tuning knob to manipulate the guiding process.
