Xia Yiwei, Riva Emanuele, Rosa Matheus I N, Cazzulani Gabriele, Erturk Alper, Braghin Francesco, Ruzzene Massimo
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Department of Mechanical Engineering, Politecnico di Milano, 20156 Milano, Italy.
Phys Rev Lett. 2021 Mar 5;126(9):095501. doi: 10.1103/PhysRevLett.126.095501.
We experimentally demonstrate temporal pumping of elastic waves in an electromechanical waveguide. Temporal pumping exploits a virtual dimension mapped to time, enabling the generation and control of edge states, typical of two-dimensional systems, in a one-dimensional waveguide. We show experimentally that the temporal modulation of the stiffness drives the transfer of edge states from one boundary of the waveguide to the other. The considered implementation, that consists of an elastic waveguide coupled with tunable electrical impedances, allows the pumping to occur in a controllable manner. The framework presented herein opens new avenues for the manipulation and transport of information through elastic waves, with potential technological applications for digital delay lines and digitally controlled waveguides. This Letter also explores higher-dimensional topological physics using virtual dimensions mapped to time in electromechanical systems.
我们通过实验证明了在机电波导中对弹性波进行时间泵浦。时间泵浦利用映射到时间的虚拟维度，能够在一维波导中产生和控制二维系统中典型的边缘态。我们通过实验表明，刚度的时间调制驱动边缘态从波导的一个边界转移到另一个边界。所考虑的实现方式由与可调电阻抗耦合的弹性波导组成，使得泵浦能够以可控方式发生。本文提出的框架为通过弹性波进行信息的操纵和传输开辟了新途径，在数字延迟线和数控波导方面具有潜在的技术应用。这篇快报还利用映射到机电系统时间的虚拟维度探索了高维拓扑物理。
