论文标题
直接测量声频谱密度和分数拓扑电荷
Direct measurement of acoustic spectral density and fractional topological charge
论文作者
论文摘要
局部密度态度（LDOS）是一种基本的光谱特性，在各种物理现象（例如波浪互动）中起着核心作用。在这里，我们报告了声学系统LDO的直接测量，并得出了声学su-Schrieffer-Heeger系统中的分数拓扑数。通过测量体积流量和用局部激发探针构型的量子压力测量，在这里通过最先进的技术对声学LDO进行了量化。基于这种方法，我们研究了声purcell效应，并在实验上建立了近场LDO与远场声发射能力之间的重要关系。此外，我们在一维声学的Su-Schrieffer-Heeger模型中检测LDO，并观察系统的分数拓扑数。我们的作品揭示了LDO在声学现象中的重要作用，并为在拓扑系统中表征和调整LDO的方式铺平了道路。
Local density-of-states (LDOS) is a fundamental spectral property that plays a central role in various physical phenomena such as wave-matter interactions. Here, we report on the direct measurement of the LDOS of acoustic systems and derive from which the fractional topological number in an acoustic Su-Schrieffer-Heeger system. The acoustic LDOS is quantified here with a state-of-the-art technique through the measurement of the volume flow rate and the acoustic pressure with a local excitation-probe configuration. Based on this method, we study the acoustic Purcell effect and establish experimentally the important relation between the near-field LDOS and the far-field acoustic emission power. Moreover, we detect the LDOS in the one-dimensional acoustic Su-Schrieffer-Heeger model and observe the fractional topological number of the system. Our work unveils the important role of the LDOS in acoustic phenomena and paves the way toward characterizing and tailoring the LDOS in topological systems.
