Fast, robust and amplified transfer of topological edge modes on time-varying mechanical chain

Abstract

We show that it is possible to successfully, rapidly and robustly transfer a topological vibrational edge mode across a time-varying mechanical chain. The stiffness values of the springs of the chain are arranged in an alternating staggered way, such that we obtain a mechanical analog of the quantum Su-Schrieffer-Heeger model which exhibits a non trivial topological phase. Using optimal control methods, we are able to design control schemes for driving the stiffness parameters, such that the transfer is done with high fidelity, speed and robustness against disorder as well as energy amplification of the target edge mode.

10 pages, 9 figures

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• Experimental observation of temporal pumping in electro-mechanical waveguides
• Topological state transfer in Kresling origami
• Adiabatic edge-to-edge transformations in time-modulated elastic lattices and non-Hermitian shortcuts
• Material vs. structure: Topological origins of band-gap truncation resonances in periodic structures
• Quantum transport in a one-dimensional quasicrystal with mobility edges
• Optimal design of fast topological pumping
• A spectrum-based shortcut method for topological systems
• On the instabilities of intrinsic thermoacoustic modes in a thermoacoustic waveguide with anechoic terminations