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Non-Hermitian skin effect in a phononic ...
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Document type :
Article dans une revue scientifique
DOI :
10.1063/5.0097530
Title :
Non-Hermitian skin effect in a phononic beam based on piezoelectric feedback control
Author(s) :
Jin, Yabin [Auteur]
Tongji University
Zhong, Wenxin [Auteur]
Tongji University
Cai, Runcheng [Auteur]
Tongji University
Zhuang, Xiaoying [Auteur]
Leibniz Universität Hannover=Leibniz University Hannover
Tongji University
Pennec, Yan [Auteur] refId
Physique - IEMN [PHYSIQUE - IEMN]
Djafari-Rouhani, Bahram [Auteur correspondant]
Physique - IEMN [PHYSIQUE - IEMN]
Journal title :
Applied Physics Letters
Pages :
022202
Publisher :
American Institute of Physics
Publication date :
2022
ISSN :
0003-6951
English keyword(s) :
Phononic crystal
Metamaterials
Piezoelectric materials
Wave mechanics
Flexural waves
Complex band structure
Feedback control system
Elastic waves
HAL domain(s) :
Sciences de l'ingénieur [physics]/Matériaux
Sciences de l'ingénieur [physics]/Acoustique [physics.class-ph]
English abstract : [en]
Non-Hermitian systems have gained a great deal of interest in various wave problems due their ability of exhibiting unprecedented phenomena such as invisibility, cloaking, enhanced sensing, or the skin effect. The latter ...
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Non-Hermitian systems have gained a great deal of interest in various wave problems due their ability of exhibiting unprecedented phenomena such as invisibility, cloaking, enhanced sensing, or the skin effect. The latter manifests itself by the localization of all bulk modes in a specific frequency range at a given boundary, with an unconventional bulk-boundary correspondence. In this work, we propose to realize the skin effect for flexural waves in a non-Hermitian piezoelectric phononic beam with feedback control between a sensor and an actuator in each unit cell. By implementing a non-Hermitian parameter, effective gain and loss can be achieved in the phononic beam characterized by complex eigen frequencies, and non-reciprocal pass bands are obtained. We highlight that the split point separating the gain and loss areas can occur not only at the edges of the Brillouin zones but also inside the same Brillouin zone. We further analyze the influence of the geometric and non-Hermitian parameters on the complex dispersions and the split point. The topology of the complex bands is characterized by the winding number, which supports the skin effect together with the non-reciprocity. The localization degree of the skin mode manifested by the enhanced beam's vibration energy at one boundary is related to the strength of the non-reciprocity, and the skin mode can be always excited regardless of the source position. Our results provide a potential platform to introduce non-Hermiticity into phononic or metamaterial systems with novel functions for elastic waves such as topological insulators, vibration attenuation or amplification, and energy harvesting.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Collections :
  • Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520
Source :
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