| 报告题目 | Light Scattering from Collective Modes of Electrons |
| 报告人 | Prof. Xiaoqin (Elaine) Li |
| 报告人单位 | Physics department, University of Texas at Austin |
| 报告时间 | 2013-05-27 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室、国际功能材料量子设计中心 |
| 报告介绍 | 报告摘要：
A powerful approach for investigating properties of matter is light scattering. In this talk, I will discuss how light scattering is used to probe collective modes of electrons in two distinct systems.
The first example focuses on light scattering from collective electron oscillations in metals called plasmons. We have recently proposed and demonstrated a novel three-dimensional orientation sensor, called “plasmonic protractor”, based on spectroscopic interrogation of a low-symmetry plasmonic nanostructure. We anticipate that the plasmonic protractor concept will inspire new development in biomolecular and material science where wide applications of spectroscopic rulers have already made profound impact.
The second example focuses on light scattering from collective spin oscillations in ferromagnetic materials called magnons. Magnons, or spin waves, are the normal modes of magnetic excitations, just as phonons are the normal modes of lattice vibrations. Using a technique called micro Brillouin light scattering, we were able to spatially map out the spin wave intensity in magnetic microstructures, use it as a local temperature sensor, and observe spin wave amplification via giant spin Hall effect.
报告人简介：
Dr. Xiaoqin (Elaine) LI obtained her Master degree in Electrical Engineering in 2002 and her PhD in physics in 2003 from the University of Michigan where she demonstrated a quantum gates based on optically driven quantum dots. She worked as a postdoctoral fellow between 2003 and 2006 at JILA Colorado, where she developed a new ultrafast spectroscopic tool for investing electron dynamics in semiconductors known as the optical Fourier transform spectroscopy. She joined the physics department at University of Texas-Austin in 2007. Her group is currently exploring unique properties of metallic and hybrid nanostructures, semiconductor quantum dots and quantum wells, spin waves in micromagnetic devices using a variety of light scattering techniques and advanced nonlinear spectroscopy methods such multidimensional Fourier transform spectroscopy. In recent years, Dr. Li has received a number of awards which include the Sloan fellowship, the NSF CAREER award, and the Presidential Early Career Award for Scientists and Engineers (PECASE). |
