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Condensed Matter Seminar: "Magneto-mechanical topological Lego"

Speaker Inbar Grinberg, University of Illinois at Urbana-Champaign
Date: 10/27/2017
Time: 1 p.m.
Location:

ESB 190

Sponsor:

Physics - Condensed Matter

Event Type: Seminar/Symposium
 

Topological insulators are an exciting class of materials, with protected conductive states on surfaces or edges in an otherwise insulating bulk. These materials are characterized by a band structure consisting of a bandgap, with the emergence of mid gap states which are protected, meaning, they are robust in face of defects and therefore have scatter-free edge conduction. In recent years there is a rising interest in producing synthetic versions of metamaterials with these topological properties, especially for producing robust waveguides with immunity to backscattering, which could be used to build lossless communication lines for electronics, optics, and acoustics waves. Furthermore, in the acoustic regime these topologically protected states can be used for applications like vibration isolation, acoustic cloaking, and pave a path towards new possibilities in controlling sound propagation.

We present a Lego like tool kit, which can be utilized to produce different acoustic metamaterials with some tailored properties (for example a band gap or a gapless system). Our system consists of discrete coupled magnet-loaded resonators, where the coupling strength is controlled by coupling rates. By changing the arrangement of distances within a resonator array, a variety of different states

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