联系我们  |  网站地图  |  English   |  移动版  |  中国科学院 |ARP
站内搜索:
首页 简介 管理部门 科研部门 支撑部门 研究队伍 科研成果 成果转化 研究生教育 党建与创新文化 科普 信息公开 办公内网 OA系统
学术活动
“会聚”时代的人工晶体讲...
Energy Research & High I...
弛豫铁电材料高压电效应的...
计算含能材料学面临的挑战
青年创新促进会学术交流会议
面向高比能水系可充电锌-...
东生讲坛第4期-分子材料聚...
Bio-inspired MEMS transd...
表面科学和先进表征技术在...
Polymer Nanocomposite Di...
Inorganic chalcogenide s...
“会聚”时代的人工晶体讲...
Materials Today Publishi...
集成计算中心计算所创新项...
东生讲坛第3期-取向组装诱...
现在位置:首页>新闻动态>学术活动
Quantum Dots–Artificial Atoms, Large Molecules or Small Pieces of Bulk?Insights from Time-Domain Ab Initio Studies
2018-05-05 12:06:44 | 【 【打印】【关闭】

  SEMINAR 

The State Key Lab of 

  High Performance Ceramics and Superfine Microstructure 

  Shanghai Institute of Ceramics, Chinese Academy of Sciences 

       

 
 

   

  Quantum Dots–Artificial Atoms, Large Molecules or Small Pieces of Bulk? 

  Insights from Time-Domain Ab Initio Studies. 

    

  Oleg Prezhdo 

  Department of Chemistry, University of Southern California 

  Senior Editor of the Journal of Physical Chemistry Letters 

    

  时间:2018511日(星期五)9:30 

  地点:嘉定园区F8F82会议室 

    

  欢迎广大科研人员和研究生参与讨论! 

  联系人:刘建军52412801 

    

  报告内容:  

  Quantum dots (QD) are quasi-zero dimensional structures with a unique combination of solid-state and atom-like properties. Unlike bulk or molecular materials, QD properties can be modified continuously by changing QD shape and size. Often, the bulk and molecular viewpoints contradict each other. The bulk view advocates that the kinetic energy of quantum confinement is greater than electron-hole interactions, that charge-phonon coupling is weak, and that the relaxation through quasi-continuous bands is rapid. The molecular view suggests strong electron-hole and charge-phonon interactions, and slow energy relaxation due to mismatch between electronic energy gaps and phonon frequencies. QDs exhibit new physical phenomena. The phonon bottleneck to electron energy relaxation and generation of multiple excitons can improve efficiencies of solar energy devices. The enhanced electron-hole interactions and high densities of states enable efficient Auger-type processes, which are impossible in both bulk and molecules. The observed QD properties are complicated by presence of ligands, dopants, defects and other atomistic features. We develop semiclassical and quantum-classical methods and implement them within time-dependent density functional theory to model far-from-equilibrium dynamics in QDs and other materials. The methods allow us to model QDs at the atomistic level and in time-domain, providing a unifying description of quantum dynamics on the nanoscale. 

  ---------------------------------------------------------------------------------------------------------------------------- 

  主讲人简介:  

Oleg V. Prezhdo obtained a Diploma in Theoretical Chemistry under Anatoly Luzano in 1991 from Kharkiv National University, Ukrainev and completed his Ph.D. under Peter Rossky at the University of Texas, Austin. After a postdoctoral fellowship with John Tully at Yale University, he joined the chemistry department at the University of Washington in 1998, achieving Associate and Full Professor in 2002 and 2005. In 2008, he was elected Fellow of the American Physical Society. In 2010, he was offered a Senior Professorship at the University of Rochester, and in 2014 at the University of Southern California. Since 2008, he has served as senior editor for the Journal of Physical Chemistry, since 2011 for the Journal of Physical Chemistry Letters, and as editor since 2013 for Surface Science Reports. Recipient of multiple national and international awards, he held invited professorships in France, Germany, Japan and China. His current research interests range from fundamental aspects of semiclassical physics, to excitation dynamics in nano-scale and biological systems.

版权所有 中国科学院上海硅酸盐研究所 沪ICP备05005480号-1
长宁园区地址:上海市长宁区定西路1295号 电话:86-21-52412990 传真:86-21-52413903 邮编:200050
嘉定园区地址:上海市嘉定区和硕路585号  电话:86-21-69906002 传真:86-21-69906700 邮编:201899