題目：Nonplanar aromatic molecules at surfaces: self-assembly, spin filtering and molecular motors
報(bào)告人：Prof. Dr. Karl-Heinz Ernst（Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland） 
時(shí)  間：2017年7月10日(周一)上午10:00
地  點(diǎn)：北京理工大學(xué) 中心教學(xué)樓610

Abstract:
 Molecular recognition among chiral molecules on surfaces is of paramount importance in biomineralization, enantioselective heterogeneous catalysis, and for the separation of chiral molecules into their two mirror-image isomers (enantiomers) via crystallization or chromatography. Understanding the principles of molecular recognition in general, however, is a difficult task and calls for investigation of appropriate model systems. One popular approach is thereby studying intermolecular interactions on well-defined solid surfaces, which allows in particular the use of scanning tunneling microscopy (STM). Examples of chiral amplification via the so-called ‘sergeant-and-soldiers’ effect as well as manipulation of chiral adsorbates via inelastic electron tunneling will be presented. In a Pasteur-type experiment at the nanoscale, molecules that constitute a dimer are spatially separated with a molecular STM tip and their absolute handedness is determined with submolecular resolution STM. Moreover, we report spin-dependent filtering of electrons by monolayers of these helical molecules. Finally the first successful electrical current- driven, unidirectional motion of a synthetic molecule will be presented. 
 

簡(jiǎn)歷：
Karl-Heinz Ernst,，瑞士聯(lián)邦材料科學(xué)與技術(shù)實(shí)驗(yàn)室高級(jí)科學(xué)家，蘇黎世大學(xué)教授,。1990年德國(guó)柏林自由大學(xué)獲博士學(xué)位,，1992年加入瑞士聯(lián)邦材料科學(xué)與技術(shù)實(shí)驗(yàn)室。曾為美國(guó)華盛頓大學(xué),、德國(guó)柏林自由大學(xué),、美國(guó)IBM實(shí)驗(yàn)室（Almaden?）訪問(wèn)學(xué)者。 長(zhǎng)期從事有機(jī)功能分子在固體表面的自組裝結(jié)構(gòu)和物性調(diào)控研究,，在手性識(shí)別和分離,、有機(jī)納米機(jī)器等方面取得了一系列創(chuàng)造性成果，其有機(jī)納米馬達(dá)相關(guān)成果曾被2016年諾貝爾化學(xué)獎(jiǎng)評(píng)審委員會(huì)在公布獲獎(jiǎng)人名單時(shí)提及,。在Nature,、Nature chemistry,、PRL、JACS,、Angew. Chem.,、NanoLett.等期刊發(fā)表論文130多篇，他引3500多次,，h-index為35,。在國(guó)際學(xué)術(shù)會(huì)議上作邀請(qǐng)報(bào)告200多次。先后擔(dān)任CHIMIA ?,、Surface Science ?,、Helvetica Chimica Acta 等學(xué)術(shù)期刊編委，并曾多次組織和主持國(guó)際學(xué)術(shù)會(huì)議,。
 

聯(lián)系方式：物理學(xué)院辦公室 （68913163）
邀請(qǐng)人：肖文德