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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。
Like spin in spintronics, the degree of valley freedom in solids can be viewed as a new information carrier for future electronic device design. Recently, the authors introduced the concept of trough into phononic crystals, revealing their vortex properties and establishing excitation selection criteria. Interestingly, the acoustic valley state can be directly excited by an external sound field and exhibit its polarization characteristics by detecting the sound field distribution both inside and outside the phononic crystal. This vortex chiral locked valley transport will provide people with a new way of sound control. Taking into account the interaction of sound and matter, other novel applications of valley vortex motions are also contemplated, such as rotational manipulation of microparticles and the like. Further research shows that there are two kinds of non-mediocre Singular Hall states, the interface between them can support the edge state of topology protection. The research shows that this edge state possesses a variety of novel properties, such as valley-selective excitation, corner-bend anti-reflection and so on.