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报告题目：
Organic Topological Materials in Organometallic Lattices
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报 告 人：
Prof. Feng Liu,
Department of Materials Science and Engineering, University of Utah, USA
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报告时间：
9月27日 下午3：0～5：0
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报告地点：
工学院1号楼210
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摘要：
Topological insulators (TIs) are a recently discovered class of materials having insulating bulk electronic states but conducting boundary states distinguished by nontrivial topology. So far, several generations of TIs have been theoretically predicted and experimentally confirmed, all based on inorganic materials. In this talk, I will present our recent study of a family of two-dimensional organic TIs made of organometallic lattices [1-4], based on first-principles calculations and tight-binding model analyses. Designed by assembling molecular building blocks of organometallic compounds with strong spin-orbit coupling into a hexagonal and Kagome lattices, these new classes of organic TIs are shown to exhibit nontrivial topological edge states in both Dirac bands and flat Chen bands [1,2], which are robust against significant lattice strain. Realization of anomalous quantum Hall effect in magnetic organic TIs with the inclusion of transition metal elements will also be discussed [3,4]. We envision that organic topological materials will greatly broaden the scientific and technological impact of topological materials.
[1] Z. F. Wang, Zheng Liu and Feng Liu, “Organic topological insulators in organometallic lattices”, Nature Commun. 4, 1471 (2013).
[2] Z. Liu, Z. F. Wang, J.-W. Mei, Y. Wu and Feng Liu, “Flat Chern Band in a Two-Dimensional Organometallic Framework”, Phys. Rev. Lett. 110, 106804 (2013).
[3] Z. F. Wang, Z. Liu and Feng Liu, “Quantum anomalous Hall effect in 2D organic topological insulator”, Phys. Rev. Lett. 110, 196801 (2013).
[4] Z. F. Wang, N. Su and Feng Liu, “Prediction of a Two-Dimensional Organic Topological Insulator”, Nano Letters, 13, 2842 (2013).
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报告人简介：
刘锋教授于1990年从美国弗吉尼亚联邦大学获得化学物理专业博士，是美国犹他大学材料系教授,现任系主任。研究领域包括纳米结构理论、纳米材料和器件、表面与界面和薄膜生长机制及计算材料物理等，是应变引导的纳米结构自主装和纳米力学构筑领域的主要开拓者之一。刘锋教授提出了多项应变引导的薄膜生长的形貌不稳定性和纳米结构（量子点，量子线等）自主装理论，被用于解释了大量的实验。一些理论预言，如Li-Liu-Lagally (LLL) 模型被实验证实。2002-2007年创建和主导了犹他大学纳米材料和器件计算设计中心。刘锋教授也是计算材料物理领域的国际学术带头人之一，在碳纳米管，石墨烯等纳米材料及器件和有机拓扑材料的计算设计方面做出一些很有意义的工作。刘锋教授已发表180多篇学术论文 (包括50篇PRL),拥有10多项专利或专利申请，撰写了8章丛书和15篇特邀综述论文。因其在分子束外延薄膜生长和半导体纳米结构的原子机理方面的杰出贡献而于2008年获得Senior Humboldt Award，在纳米结构理论和应变引导的纳米结构自主装方面的杰出贡献而于2011年被选为APS Fellow。2012年入选中组部海外高层次人才引进B类“千人计划”，受聘清华大学访问教授。2010年刘锋教授的一项专利被Sorensen Capital投资公司买断成立了Solan 公司，研发石墨烯和炭基纳米材料在太阳能，光电和其他器件的应用。刘锋教授兼任该公司科学顾问。
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Host：
孙强 sunqiang@pku.edu.cn
