物理學院“博約學術沙龍”系列報告第26期 (2012年第9期，總第26期)
 

題  目：  Theoretical study of the optical and electron transport properties of single molecules
報告人：  田廣軍 博士
單  位：  Division of Theoretical Chemistry& Biology,
                KTH Royal Institute of Technology, Sweden
時  間： 2012年7月20日(星期五)上午11:00
地  點： 中心教學樓610

ABSTRACT
Electroluminescence from single molecules can be observed under the excitation of the highly localized tunneling electrons in a scanning tunneling microscope. Recent experiments on porphyrin derivatives and C60 fullerene molecules have shown some surface plasmon related features which have not been explained before. To understand the underlying mechanisms, we have developed a general theoretical approach to describe the electroluminescence from molecules near a metal surface induced by both electron tunneling and local surface plasmon excitations simultaneously. The new method has been applied to study the electroluminescence spectra of porphyrin derivatives and C60 molecules and, for both types of molecules, the simulated spectra are in good agreement with the corresponding experimental spectra. Through our simulation, we have nicely explained the observed unusual large variation of emission spectral profiles of porphyrin derivatives and we are able to give unambiguous assignment of the measured spectra of C60 molecules. I will also give a brief introduction of some other works including electron transport properties of weakly coupled bipyridine molecular junctions and vibrationally-resolved optical spectra of polyatomic molecules.

References:
1. Density-matrix approach for the electroluminescence of molecules in a scanning tunneling microscope, Guangjun Tian, Ji-Cai Liu, and Yi Luo, Phys. Rev. Lett. 106, 177401 (2011).
2.Electroluminescence of molecules in a scanning tunneling microscope: Role of tunneling electrons and surface plasmons, Guangjun Tian and Yi Luo, Phys. Rev. B 84, 205419 (2011).

簡  歷:
田廣軍，男，1982年生。2008年在北京理工大學物理學院(原理學院物理系)獲得碩士學位，導師為蘇文勇老師。2008年獲得國家留學基金委資助到瑞典皇家工學院攻讀博士學位至今，導師為羅毅教授。此期間主要從事分子電子學與光子學等相關方面的研究，研究方向主要包括單分子電致熒光，單分子電子輸運特性，多原子分子的光學光譜以及X射線光譜等。現在以第一作者已發表Physical Review Letters論文1篇和Physical Review B論文1篇。

聯系方式：物理學院辦公室（68913163）
網址: http://physics.bit.edu.cn/

（審核：姜艷）