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Nonconventional topological band properties and gapless helical edge states in elastic phononic waveguides with Kekule distortion

机译:具有尾部失真的弹性声子波导中的非转化拓扑带性能和无效螺旋边缘状态

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摘要

This study investigates the topological behavior of a continuous elastic phononic structure characterized by a three-term Kekule distortion. The elastic waveguide consists of a hexagonal unit cell whose geometric dimensions are intentionally perturbed according to a generalized Kekule scheme. The resulting structure exhibits an effective Hamiltonian that resembles a quantum spin Hall system, hence suggesting that the waveguide can support helical topological edge states. Using first-principles calculations, we show the existence of nondegenerate pseudospin states and a very peculiar six-lobe pseudospin texture and Berry curvature pattern. Important insights are also provided concerning the topological states in the Kekule lattice, so far considered indistinguishable, and their critical role in enabling unique gapless edge states, typically not achievable in phononic systems.
机译:本研究调查了连续弹性声孔结构的拓扑行为,其特征在于三术尾部变形。弹性波导由六角形单元电池组成,其几何尺寸是有意地扰动的是根据广义的颗粒方案进行扰动。所得到的结构表现出一种类似于Quantum Spin Hall系统的哈密顿,因此建议波导可以支持螺旋拓扑边缘状态。使用第一原理计算,我们展示了非替补伪旋流态的存在和一个非常奇特的六瓣伪旋流纹理和莓果曲率模式。还提供了关于瓜扣格晶格中的拓扑状态的重要见解,到目前为止被认为是难以区分的,以及它们在启用独特的无间隙边缘状态方面的关键作用,通常在声子系统中无法实现。

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  • 来源
    《Physical review》 |2019年第21期|214110.1-214110.5|共5页
  • 作者单位

    Purdue Univ Sch Mech Engn Ray W Herrick Labs W Lafayette IN 47907 USA;

    Purdue Univ Sch Mech Engn Ray W Herrick Labs W Lafayette IN 47907 USA;

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