密苏里大学机械与航空工程系黄国良教授到我院做学术报告
应宁波大学机械工程与力学学院邀请，密苏里大学机械与航空系黄国良教授于2019年1月9日星期三来我院做学术报告，报告题目“Topological Kagome Lattice for Mechanical Insulators”。
黄国良教授主要向学院师生介绍了其研究团队在拓扑力学和超材料领域的最新研究成果。内容主要包括一维晶格拓扑效应，二维平面Kagome 晶格的拓扑效应以及二维平面Kagome 晶格的极化效应。报告内容由浅入深，黄国良教授首先将Quantum Valley-Hall Insulator （QVHI）和Quantum Spin-Hall Insulator （QSHI）引入一维质量-弹簧Kagome晶格，发现一维晶格的拓扑效应。并将拓扑和极化效应发展到二维Kagome 晶格。此研究成果有助于了解拓扑效应在一维和二维Kagome晶格中的发展，并有望将量子力学结构应用到传统力学中来。
黄国良教授的报告吸引了很多学院的师生前来参加，报告厅里座无虚席，观众对他的介绍反应热烈，不时有深入的讨论和问题。这次报告也吸引了学校之外的许多听众，反映了大家对黄教授的研究工作的高度关注。
Topological Kagome Lattice for Mechanical Insulators
Invited by the School of Mechanical Engineering and Mechanics of Ningbo University, Prof. Guoliang Huang from Departments of Mechanical and Aerospace Engineering, University of Missouri, presented a talk entitled " Topological Kagome Lattice for Mechanical Insulators" to a broad audience of researchers and graduate students on Jan. 9th, 2019.
Prof. Huang presented their up-to-date outcomes on topological Mechanics of Edge Waves in Kagome Lattices. Both Quantum Valley-Hall Insulator (QVHI) and Quantum Spin-Hall Insulator (QSHI) were implemented into a simple mass-spring Kagome lattice. The transition from the trivial state to the topological one was described by an invariant Chern number function of a contrast parameter. The band diagram and helical edge states characteristic of QVHI and QSHI were obtained by a combination of numerical and analytical methods. In particular, these states were shown to be Stoneley wave solutions to a set of asymptotic continuous motion equations. They also investigated a mechanical wave analogue of the quantum Hall effect (QHE) in two-dimensional periodically time-modulated materials. Numerical simulations demonstrate the existence of topologically protected one-way edge states around sharp corners, defects and non-uniform modulated phases at the boundary of the time-modulated material. On the other hand, static mechanical polarization effects of Kagome lattice was captured by developing new micro-twisting theory, which was also validated by numerical simulation.
