题目：Optical Multi-dimensional Coherent Spectroscopy

报告人：Hebin Li  Florida International University

地点： 教十二-201

时间： 3月15日，周三，15:00-16:00

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, I will introduce optical multi-dimensional coherent spectroscopyand its applications to study atomicvapors and semiconductor nanostructures.Atomicvapors 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. I will presentseveral 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.

个人简介：

Hebin Li is currently an assistant professor in the Department of Physics at Florida International University. He received his B.S. in physics from Wuhan University in 2001, and his Ph.D. in physics from Texas A&M University under the supervision of Dr. Marlan Scully. Before joining the faculty at FIU in 2013, Dr. Li worked as a Research Associate with Dr. Steven Cundiff at JILA, a joint institute of the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder. Dr. Li’s research focuses on light-matter interactions using techniques in ultrafast spectroscopy and quantum optics. He is particularly interested in many-body quantum systems consisting of interacting atoms, molecules and electrons. He has published over 40 articles in peer-reviewed journals such as Nature, Nature Communications, Physical Review Letters, Physical Review A/B, Optics Letters, Optics Express, etc.

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