Acoustic topological insulators have exotic states on their topological interfaces, which provide an extraordinary approach to control the sound wave with a backscattering-immune property. Non-contact particle manipulations play an important role in life science, and acoustic tweezers are gaining increasing attention due to their better biological compatibility. In this Letter, we use an acoustic topological insulator to achieve non-contact particle manipulations such as microparticle trapping and separation. Based on the Su–Schrieffer–Heeger (SSH) model, we can obtain the topological interfacial states. Then, we calculate the flow distribution fields and acoustic radiation force distribution fields, and the results show that we can separate two particles with the same size and density. Our study provides a guide to design topological insulator devices and achieves non-contact label-free microparticle manipulations, which exhibits enormous application potential in the biomedical field.

中文翻译：

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使用声学拓扑绝缘体分离微粒

声拓扑绝缘体在其拓扑界面上具有奇异状态，这提供了一种特殊的方法来控制具有反向散射免疫特性的声波。非接触式粒子操作在生命科学中发挥着重要作用，声学镊子因其更好的生物相容性而受到越来越多的关注。在这封信中，我们使用声学拓扑绝缘体来实现非接触式粒子操作，例如微粒捕获和分离。基于 Su-Schrieffer-Heeger (SSH) 模型，我们可以获得拓扑界面状态。然后，我们计算了流动分布场和声辐射力分布场，结果表明我们可以分离两个大小和密度相同的粒子。