Publication

Active Acoustic Su-Schrieffer-Heeger-like System

2024

Abstract

An acoustic dimer composed of two electronically controlled electro-acoustic resonators is presented in view of exploring one dimensional topological phenomena.Active control allows for real-time manipulation of the metamaterial's properties, including its mechanical mass, resistance, compliance and internal coupling.The latter enables active tuning of topological phase transition in the effective acoustic Su-Schrieffer-Heeger system.The electronic control scheme used for simultaneous impedance synthesis and dimerisation of the unit cell is presented.Band structures derived from finite element simulations and the experimental data consistently demonstrate control of band-folding Bragg gap size by the user-tunable dimerisation parameter.

Official source

https://infoscience.epfl.ch/entities/publication/8513b0f8-f115-46b0-b087-6105a866b2b1

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2024

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8513b0f8-f115-46b0-b087-6105a866b2b1

About this result

Related concepts (32)

Topological insulator

A topological insulator is a material whose interior behaves as an electrical insulator while its surface behaves as an electrical conductor, meaning that electrons can only move along the surface of the material. A topological insulator is an insulator for the same reason a "trivial" (ordinary) insulator is: there exists an energy gap between the valence and conduction bands of the material. But in a topological insulator, these bands are, in an informal sense, "twisted", relative to a trivial insulator.

Topological defect

Topological defects or solitons are irregularities or disruptions that occur within continuous fields or ordered states of matter. These defects, which can take various forms such as points, lines, or surfaces, are characterized by their stability and the fact that they cannot be 'smoothed out' or removed through continuous transformations of the field or material. They play a significant role in various areas of physics, including condensed matter physics, cosmology, and quantum field theory, and can have profound effects on the properties and behavior of the systems in which they occur.

Impedance analogy

The impedance analogy is a method of representing a mechanical system by an analogous electrical system. The advantage of doing this is that there is a large body of theory and analysis techniques concerning complex electrical systems, especially in the field of filters. By converting to an electrical representation, these tools in the electrical domain can be directly applied to a mechanical system without modification.