声子晶体中的声谷态输运
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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。
Like the spin in spintronics,the valley index in solid-state materials can be viewed as a new carrier of information,which is useful for designing modern electronic devices.Recently,we have applied the concept of valleytronics to sonic crystals,revealed the vortex nature 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 transport properties(such as valley selective excitations and antireflection in bent corners).
Like the spin in spintronics,the valley index in solid-state materials can be viewed as a new carrier of information,which is useful for designing modern electronic devices.Recently,we have applied the concept of valleytronics to sonic crystals,revealed the vortex nature 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 transport properties(such as valley selective excitations and antireflection in bent corners).
引文
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[2]Xiao D,Yao W,Niu Q.Phys.Rev.Lett.,2007,99:236809
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[15]Zhang X D.Phys.Rev.Lett.,2008,100:113903
[16]Lu L,Joannopoulos J D,Solja?i?M.Nat.Photonics,2014,8:821
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[32]Lu J Y,Qiu C Y,Ye L P et al.Observation of topolgical valley transport of sound in sonic crystal.Nat.Phys.2016,DOI:10.1038/nphys3999