Coherent Detection of the Oscillating Acoustoelectric Effect in Graphene

作者：Yicheng Mou, Jiayu Wang, Haonan Chen, Yingchao Xia, Hailong Li, Yan Qing, Xue Jiang, Yijia Wu, Wu Shi, Hua Jiang, Xiangnan Xie, Cheng Zhang · 发表于：Physical Review Letters · 年份：2025 · DOI：10.1103/physrevlett.134.096301 · 被引用次数：9 · 研究领域：Mechanical and Optical Resonators、Carbon Nanotubes in Composites、Force Microscopy Techniques and Applications

In recent years, surface acoustic waves (SAWs) have emerged as a novel technique for generating quasiparticle transport and band modulation in condensed matter systems. SAWs interact with adjacent materials through piezoelectric and strain fields, dragging carriers in the direction of wave propagation. Most studies on the acoustoelectric effect have focused on the collective directional motion of carriers, which generates a steady electric potential difference, while the oscillating component from dynamic spatial charge modulation has remained challenging to probe. In this Letter, we report the coherent detection of the oscillating acoustoelectric effect in graphene. This is achieved through the coherent rectification of spatial-temporal charge oscillation with electromagnetic waves emitted by interdigital transducers. We systematically investigate the frequency and gate dependence of rectified signals and quantitatively probe the carrier redistribution dynamics driven by SAWs. The observation of the oscillating acoustoelectric effect provides direct access to the dynamic spatial charge modulation induced by SAWs through transport experiments.