中文摘要：

如同自旋电子学中的自旋，固体中的能谷自由度可视为新的信息载体，从而用于未来的电子器件设计。最近，作者将谷态的概念引入到声子晶体中，揭示其涡旋属性并建立激发选择定则。有趣的是，声谷态可由外部声场直接激发，并通过探测声子晶体内外的声场分布展示其极化特性。这种涡旋手性锁定的谷输运将为人们提供全新的声波操控方式。考虑到声和物质的相互作用，也可预期谷涡旋态的其它新奇应用，如旋转操纵微颗粒等。进一步研究发现，存在两类拓扑非平庸的声谷霍尔相，它们之间的界面可以支持拓扑保护的边缘态。研究表明，该边缘态具备各种新颖的性质，如谷选择性激发、边界拐弯抗反射等。

英文摘要：

Like the spin in spintronics, the valley index in solid-state materials can be viewed as a new carder of information, which is useful for designing modern electronic devices. Recently, we have applied the concept of valleytronics to sonic crystals, revealed the vortex na- ture of valley states, and established valley-selection rules. Interestingly, the acoustic valley states can be stimulated directly by external sound, and detected through the field distributions inside and outside the crystal. The vortex chirality-locked valley transport enables a novel manipulation of sound. Considering the interaction between sound and matter, other fancy applications can also be anticipated for the valley vortex states, such as rotating micro-particles. In addition, we find that there exist two kinds of topologically distinct acoustic valley Hall phases, and an interface separating them can host topologically-protected edge states, associated with many exotic trans- port properties （such as valley selective excitations and antireflection in bent corners）.