學術

“理學大師論壇”第十五講——王廣厚院士:Cluster modification on Dirac quantum materials

編輯:周婷 來源:物理學系 時間:2018年11月05日 訪問次數:10  源地址

題目: Cluster modification on Dirac quantum materials

報告人:王廣厚院士  

                南京大學物理學院

                固體微結構物理國家重點實驗室

地點:教十二-201

時間:117日,周三,15:00-16:00


Abstract

    Recently some exotic quantum condensed materials have been found, for instance, graphene and topological insulators, etc. Graphene is a single atomic layer consisted of carbon atoms arranged in hexagonal honeycomb structure with a novel quantum state and linear dispersion of the energy band structure. The topological insulator is a bulk insulating material with a Dirac-type conducting surface state (SS) and its dissipationless transport of topological surface state(TSS) protected by the time-reversal symmetry. Both of them have shown unique crystal and electronic structures and other properties, attracting potential applications to electronics, photonics, spintronics and quantum computation, etc. However, many problems remain to be solved, we have used atomic clusters deposited on their surfaces and fabricate them like field effect transistors in order to measure their transport properties and observed unexpected phenomena which might be useful in near future. (1) The electronic coherence is greatly enhanced after Pd cluster deposition. Moreover, the saturation is observed at zero temperature both before and after cluster deposition. (2) We build the graphene-based spintronic devices by using the Ir clusters coating, where the spin relaxation period can be tuned in an order with a back gate voltage.  The spin relaxation is believed to arise from the Kane-Mele spin orbit coupling in graphene, and spin orbit coupling strength has 5.5meV. (3) The electronic transport of surface states of topological insulator Bi2Te3 from AB to AAS interference can be modulated by Co clusters.


報告人簡介:

        王廣厚, 原子分子與團簇物理學家,中國科學院院士。現為南京大學物理學院和固體微結構物理國家重點實驗室教授,博士研究生導師。國際小顆粒與無機團簇會議(ISSPIC)國際顧問委員會委員,《材料科學論壇》(Materials Science Forum)(瑞士)國際顧問編委。《物理學進展X》(Advances in Physics X(英國)1963年畢業于北京師范大學物理系,1980.6-1982.8在美國紐約州立大學(奧巴尼)物理系訪問學者,研究粒子與固體相互作用, 1990.10 – 1991.10在德國薩爾蘭大學新材料研究所和BASF研究中心作客座教授,研究孤立原子簇和納米材料的結構和性質。

        長期從事物理學交叉學科的科學研究和教學工作。1984年起,在國內率先開展原子團簇物理的實驗和理論研究并取得了一系列創造性成果。著有《粒子同固體相互作用物理學》兩卷本(上、下冊,科學出版社,19881991)和《團簇物理學》(上海科學技術出版社,2003)等學術著作。在國際學術刊物(SCI)上發表論文300多篇。帶領研究組自行設計和研制成功三代團簇實驗裝置。獲得包括國家自然科學二等獎、胡剛復物理獎和教育部科技進步一等獎等9項科技獎和10多項發明專利。培養研究生46名,其中畢業博士生33名。主持了國家自然科學基金重大項目(原子團簇的化學和物理)等10多個科研項目。主持了包括第十二屆小顆粒與無機團簇國際會議ISSPIC-12)在內的4次國際學術會議,在國際上產生很大的影響。

 

歡迎老師和同學參加!


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