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arXiv 1508.06243cond-mat.mes-hall
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强耦合超材料环晶格中拓扑保护的声学螺旋边缘态和界面态

Topologically protected acoustic helical edge states and interface states in strongly coupled metamaterial ring lattices

Xue-Feng Zhu, Yu-Gui Peng, Xiang-Yuan Yu, Han Jia, Ming Bao, Ya-Xi Shen, De-Gang Zhao

摘要:

时间反演(T)不变性拓扑绝缘体是凝聚态物理的重要发现之一,其最吸引人的特点是基于自旋的拓扑保护,即完全消除了具有一定自旋的导电电子在物质表面的散射.近年来,它使拓扑绝缘体从电子学向光子学、声子学和力学的范式转变,不仅带来了新的物理学,而且在强波输运方面也有潜在的应用。尽管人们对实现拓扑保护的声波输运越来越感兴趣,但T不变声学拓扑绝缘体尚未实现。在这里,我们报告的声学拓扑绝缘体的第一个演示:一个强耦合的超材料环晶格,支持单向传播的螺旋边缘状态下的T-对称,反向散射免疫边界突变。非常独特的是由于晶格位错而形成自旋过滤界面态。拓扑保护的边缘态和界面态的形成机制适用于各种其他波系统或更高的维度。

英文摘要:

Time reversal (T) invariant topological insulator is widely recognized as one of the fundamental discoveries in condensed matter physics, for which the most fascinating hallmark is perhaps a spin based topological protection, the total cancellation of scattering of conduction electrons with certain spins on matter surface. Recently, it has created a paradigm shift for topological insulators, from electronics to photonics, phononics as well as mechanics, bringing about not only involved new physics but also potential applications in robust wave transport. Despite the growing interests in realizing topologically protected acoustic wave transport, T-invariant acoustic topological insulator has not yet been achieved. Here, we report the first demonstration of acoustic topological insulator: a strongly coupled metamaterial ring lattice that supports one-way propagation of helical edge states under T-symmetry, backscattering immune to boundary abrupt variations. The very unique thing is the formation of spin-filtered interface states due to lattice dislocations. The mechanism underlying the formation of topologically protected edge states and interface states is applicable in various other wave systems or higher dimensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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