二维蜂窝弹性材料拓扑态的研究

doi:10.13438/j.cnki.jdzk.2022.04.009

吉首大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (4): 47-50.DOI: 10.13438/j.cnki.jdzk.2022.04.009

二维蜂窝弹性材料拓扑态的研究

李荫铭，孔鹏，毕仁贵，何兆剑，邓科

（吉首大学物理与机电工程学院，湖南吉首 416000）

出版日期:2022-07-25 发布日期:2022-10-28
通讯作者: 孔鹏（1988—），男，河南信阳人，吉首大学物理与机电工程学院讲师，博士，主要从事凝聚态物理研究.E-mail:kongpeng@jsu.cn.
作者简介:李荫铭（1995—），男，湖南郴州人，吉首大学物理与机电工程学院硕士研究生，主要从事凝聚态物理研究
基金资助:
吉首大学校级课题项目（JDY20028）

Topological States of Two-Dimensional Honeycomb Elastic Materials

LI Yinming,KONG Peng,BI Rengui,HE Zhaojian,DENG Ke

(College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)

Online:2022-07-25 Published:2022-10-28

摘要/Abstract

摘要：将谷拓扑态的概念引入弹性材料，设计了一种二维蜂窝弹性声子晶体，当系统受反演对称性保护时，在K(K′)点处出现3个线性简并的狄拉克点，分布在不同的频段.通过调整其几何结构参数，破坏体系的空间对称性，使得在K(K′)点处的狄拉克点打开，形成能谷.这种多频段的能谷之间存在连接上、下体带的边缘态，在弹性材料中利用边缘态实现拓扑输运，可以设计出有良好性能的声学器件，具有一定的研究价值.

关键词： 弹性材料, 声子晶体, 谷拓扑态, 有限元

Abstract: We introduce the concept of valley states to elastic materials and design a two-dimensional honeycomb elastic phonon crystal.When the system is protected by inverse symmetry,three pairs of Dirac points appear at the K and K′ point,distributed in different frequency bands.The spatial symmetry of the system is broken by adjusting its geometrical structure parameters so that the Dirac points open and form valley at the K and K′ point.In this multi-band valley exists edge states connecting the upper and lower body bands,which is used in elastic materials can be used to achieve edge transport and design acoustic devices with good performance.

Key words: elastic materials, phonon crystals, valley topological state, finite element

李荫铭, 孔鹏, 毕仁贵, 何兆剑, 邓科. 二维蜂窝弹性材料拓扑态的研究[J]. 吉首大学学报（自然科学版）, 2022, 43(4): 47-50.

LI Yinming, KONG Peng, BI Rengui, HE Zhaojian, DENG Ke. Topological States of Two-Dimensional Honeycomb Elastic Materials[J]. Journal of Jishou University(Natural Sciences Edition), 2022, 43(4): 47-50.

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二维蜂窝弹性材料拓扑态的研究

Topological States of Two-Dimensional Honeycomb Elastic Materials

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