from    
to    
search  

 


“清芬”学术论坛-分子诊断探针精准设计与临床应用研究
环境学术沙龙第699期:Integrated Modeling of Economy-Energy-Environment Nexus
PYRROLE-BASED POROUS MATERIALS (AND FRIENDS)
物理系colloquium: Unveiling Microscopic Dynamics of Energy Transfer atInterfa...
报告题目:
Coherence and Energy Transfer in Conjugated Chromophores
 报告人:
Prof. Sergei Tretiak
Los Alamos National Laboratory
报告时间:
2018-04-29 16:00
报告地点:
蒙民伟科技大楼南楼 S727会议室
主办单位:
化学系
  简介:

摘要:The role of coherence signifying concurrent electron-vibrational dynamics in complex natural and man-made systems is currently a subject of intense experimental and theoretical studies. Particularly, gaining control of this phenomenon is important for energy and charge transport when designing functional materials for various technologies, ranging from sensing, imaging, solar energy harvesting, to future optoelectronic devices. Using our Non-adiabatic EXcited-state Molecular Dynamics simulations (NEXMD) framework, we study ultrafast dynamics and exciton transport in several distinct molecular systems.  These simulations reveal a ubiquitous pattern in the evolution of photoexcitation spanning dynamics of multiple electronic states. Symmetries of the excited state wavefunctions define specific form of the derivative non-adiabatic coupling driving non-adiabatic quantum transitions, which leads to a collective asymmetric vibrational excitation coupled to the electronic system. This promotes subsequent wave-like evolution of the excited state wavefunction preserving specific phase and amplitude relations across the ensemble of trajectories, facilitating efficient energy funneling. Proposed simple model explains appearance of coherent exciton-vibrational dynamics due to non-adiabatic quantum transitions, which is universal across multiple molecular systems studied.  Observed relationships between spatial extent/properties of electronic wavefunctions and resulting electronic functionalities allow us to understand and to potentially manipulate excited state dynamics and energy transfer pathways in a number of organic molecular materials.

今日相关信息
清华文创讲座第十二期:彭林说礼:王国维及...
 
同类别相关信息
复杂体系的激发态量子化学研究
学堂班系列讲座:“基于光热转换的近红外...
清华2023高分子前沿讲座-面向柔性电子...
团簇酶与神经创伤
清华2023高分子前沿讲座-基于分子链结...
学术活动