Title：Theoretical Study on Electron Transport and Optical Properties of Single-Molecular System in Localized Metal Nanojunctions
Lecturer：Professor Guangjun Tian, Yanshan University
Time：9:30a.m. ,June 24th,2019(Monday)
Place：Room 201, Chemistry Building(Middle)
Abstract：
Constructing a functional device by combining a single molecule with a metal nanoelectrode is one of the possible solutions for further miniaturization of optoelectronic components in the future. For single-molecule systems with localized metal nano-junctions, their optoelectronic properties are usually not only related to their own properties, but also affected by many external conditions. In this case, the description of its optoelectronic properties by using appropriate theoretical calculations has become an important means for us to understand the relevant experimental results and explore the basic laws. In this report, we will mainly introduce our theoretical research on the electrical transport and optical properties of local single-molecule systems in metal nano-junctions. First, the influence of electron-vibration coupling on the electrical transport properties of single-molecule systems will be discussed, and the possibility of modulating molecular conductance by adjusting the electron-vibration coupling strength will also be discussed. In addition, the effects of local surface plasmon (LSP) formed between metal nano-electrodes on the optical properties of molecular systems, especially the effect of LSP on the electroluminescence spectrum of single-molecule systems and the spatial distribution of LSPs to molecules ,and the effects of optical absorption and Raman scattering on the system.
About the lecturer：
Professor Guangjun Tian obtained his Doctor degree from the Royal Institute of Technology (KTH) in the Department of Theoretical Chemistry and Biology in 2013. His tutor is Professor Yi Luo. From 2013 to 2015, he worked as a postdoctoral researcher in the research group of Professor Yi Luo of the Royal Institute of Technology in Sweden. From 2016 on, he is a professor and doctoral supervisor of the Department of Applied Physics, College of Science, Yanshan University. He is mainly engaged in molecular optoelectronics research, and has achieved a series of research results on theoretical description of single-molecule electroluminescence induced by scanning tunneling microscopy, theoretical study of electrical transport properties of molecular devices, theoretical design of functional monomolecular devices, molecular system tip-enhanced Raman scattering, theoretical simulation of imaging and the theoretical calculation of the spectral properties of molecular systems. He has published 40 research papers in journals such as Phys. Rev. Lett., J. Am. Chem. Soc., Angew. Chem., Phys. Rev. B, J. Phys. Chem. C. Currently, he is the host of the National Natural Science Foundation of China and the Excellent Natural Fund of the Natural Science Foundation of Hebei Province.
