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理学院系列学术报告会(Hebin Li(李鹤槟)博士)

2016-11-29 10:48:21  点击:[]

 

理学院系列学术报告会

 

报告题目:Optical Multi-dimensional Coherent Spectroscopy

 

报告人:Hebin Li (李鹤槟)    Assistant Professor, Florida International University

 

主持人:李 教授

 

时间:2016125日(星期一)上午10:30-11:30

 

地点:至善楼理学院200会议室

 

 

报告人简介:李鹤槟(Hebin Li,博士,美国佛罗里达国际大学(FIU)助理教授(Assistant Professor)。

 

李鹤槟博士于2001年毕业于武汉大学,获物理学学士学位,曾任职于武汉烽火集团某项目研发组负责人。2010年获美国Texas A&M University物理学博士学位,师从国际著名量子物理学家Marlan Scully 教授。2010-2013年于美国JILA实验室Steven Cundiff 教授研究组从事博士后研究;2013年加入FIU物理系。李鹤槟博士主要从事激光场与原子相互作用的动力学过程及相干调控、激光场与半导体纳米结构(量子井、原子级二维体系等)相互作用的动力学过程及相干调控、多维超快Fourier变换光谱技术及应用等方面的研究,先后在NatureNature comunicationPhysics review LetterPhysics review BOptical letter等刊物发表学术论文40余篇,在光学相关领域多次受邀做学术报告,是PRLPRAPRBOptics LetterJOSABJPCApplied Optics等刊物以及美国国家科学基金(NSF)、美国化学协会石油研究基金(ACS PRF)等项目评审人。

 

 

欢迎有兴趣的老师和同学参加。

 

 

报告摘要:

 

The concept of multi-dimensional coherent spectroscopy originated in nuclear magnetic resonance (NMR) where it revolutionized NMR studies of molecular structure and dynamics. In the past two decades, the same concept has been implemented in the optical region with femtosecond lasers. In the experiment, the nonlinear response of a sample to multiple laser pulses is measured as a function of time delays. A multi-dimensional spectrum is constructed by taking a multi-dimensional Fourier transform of the signal with respect to multiple time delays.

 

In this presentation, He will introduce optical multi-dimensional coherent spectroscopy and its applications to study atomic vapors and semiconductor nanostructures. Atomic vapors provide a simple test model to validate the method, while the obtained 2D spectra reveal the surprising collective resonance due to the dipole-dipole interaction in a dilute gas. By extending the technique into a third dimension, 3D spectra can unravel different pathways in a quantum process and provide complete and unambiguous information to construct the full Hamiltonian of the system. Besides atomic vapors, optical multi-dimensional coherent spectroscopy is also a powerful tool for studying many-body dynamics and coupling in solid-state systems such as semiconductor nanostructures. He will present several applications in semiconductor quantum wells and self-assembled quantum dots, where unique information about the systems can be obtained from 2D spectra. The technique will also have advantages in studying valley carrier dynamics in atomically thin 2D semiconductors.