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報告題目：
Organic Topological Materials in Organometallic Lattices
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報 告 人：
Prof. Feng Liu,
Department of Materials Science and Engineering, University of Utah, USA
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報告時間：
9月27日 下午3：0～5：0
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報告地點：
工學院1号樓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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報告人簡介：
劉鋒教授于1990年從美國弗吉尼亞聯邦大學獲得化學物理專業博士，是美國猶他大學材料系教授,現任系主任。研究領域包括納米結構理論、納米材料和器件、表面與界面和薄膜生長機制及計算材料物理等，是應變引導的納米結構自主裝和納米力學構築領域的主要開拓者之一。劉鋒教授提出了多項應變引導的薄膜生長的形貌不穩定性和納米結構（量子點，量子線等）自主裝理論，被用于解釋了大量的實驗。一些理論預言，如Li-Liu-Lagally (LLL) 模型被實驗證實。2002-2007年創建和主導了猶他大學納米材料和器件計算設計中心。劉鋒教授也是計算材料物理領域的國際學術帶頭人之一，在碳納米管，石墨烯等納米材料及器件和有機拓撲材料的計算設計方面做出一些很有意義的工作。劉鋒教授已發表180多篇學術論文 (包括50篇PRL),擁有10多項專利或專利申請，撰寫了8章叢書和15篇特邀綜述論文。因其在分子束外延薄膜生長和半導體納米結構的原子機理方面的傑出貢獻而于2008年獲得Senior Humboldt Award，在納米結構理論和應變引導的納米結構自主裝方面的傑出貢獻而于2011年被選為APS Fellow。2012年入選中組部海外高層次人才引進B類“千人計劃”，受聘清華大學訪問教授。2010年劉鋒教授的一項專利被Sorensen Capital投資公司買斷成立了Solan 公司，研發石墨烯和炭基納米材料在太陽能，光電和其他器件的應用。劉鋒教授兼任該公司科學顧問。
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Host：
孫強 sunqiang@pku.edu.cn
