Pumping with Symmetry
Authors: Julio Andrés Iglesias Martínez, Muamer Kadic, Vincent Laude, Emil Prodan
AI-generated Key Points
- Symmetry enhancement in re-configurable materials and meta-materials
- Deformations leading to higher symmetry class and reduction in dispersion bands
- Spectral resonant gaps closing along singular manifolds with topological charges
- Example of deformation in an acoustic crystal resulting in adiabatic cycle with Chern number and Thouless pumping
- General principle for recognizing and engineering topological adiabatic processes around submanifolds with enhanced symmetries
- Context of frieze groups for studying periodic quasi 1-dimensional physical systems
- Switch from molecular systems to meta-materials with symmetric patterns influencing resonant mode dynamics
- Insights into behavior of re-configurable materials and meta-materials regarding symmetry enhancement and implications for topological adiabatic processes
- Potential applications in complex materials design and engineering.
Abstract: Re-configurable materials and meta-materials can jump between space symmetry classes during their deformations. Here, we introduce the concept of singular symmetry enhancement, which refers to an abrupt jump to a higher symmetry class accompanied by an un-avoidable reduction in the number of dispersion bands of the excitations of the material. Such phenomenon prompts closings of some of the spectral resonant gaps along singular manifolds in a parameter space. In this work, we demonstrate that these singular manifolds carry topological charges. As a concrete example, we show that a deformation of an acoustic crystal that encircles a $p11g$-symmetric configuration of the cavity resonators results in an adiabatic cycle that carries a Chern number in the bulk and displays Thouless pumping at the edges. The outcome is a very general principle for recognizing or engineering topological adiabatic processes in complex materials and meta-materials.
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