与电荷密度波跃迁相关的声电电流的显著调制
Significant modulation of acoustoelectric current associated with charge density wave transitions
AI总结：
该研究探究了CDW跃迁材料的AE电流特性，建立应变修正电导率模型解释其调制机制，为范德华材料的SAW-电子相互作用研究及应变电子学发展提供了有力支撑。
AI中文摘要：
我们研究了压电衬底上表面声波（SAW）诱导的、发生电荷密度波（CDW）跃迁的材料中的声电（AE）电流。NbSe₃和2H-TaSe₂的AE电流的极性和大小因CDW跃迁而被调制；我们还发现，AE电流的符号取决于SAW相对于衬底晶轴的传播方向。假设应变修正电导率的唯象模型可定性解释与CDW跃迁相关的AE电流的显著调制，以及SAW传播取向依赖性。本研究结果为探索范德华材料中的SAW-电子相互作用提供了有力探针，凸显了其在推进新兴应变电子学领域的潜力。
英文摘要：
We studied acoustoelectric (AE) currents in materials that undergo charge density wave (CDW) transitions, induced by a surface acoustic wave (SAW) on a piezoelectric substrate. The polarity and magnitude of the AE current in NbSe$_3$ and 2H-TaSe$_2$ were modulated due to their CDW transitions. We also found that the sign of the AE current depends on the SAW propagation direction with respect to the crystalline axis of the substrate.A phenomenological model assuming strain-modified conductivity can qualitatively account for the significant modulation of the AE current associated with the CDW transition, as well as the SAW propagation orientation dependence. The present results offer a powerful probe for exploring SAW-electron interactions in van der Waals materials, thereby highlighting their potential for advancing the emerging field of straintronics.
