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Multidimensional Photoelectron Spectroscopy of the Coherent Optical Response of Metals

来源：
报告题目   Multidimensional Photoelectron Spectroscopy of the Coherent Optical Response of Metals
报告人   Prof. Hrvoje Petek
报告人单位   Department of Physics and Astronomy,University of Pittsburgh
报告时间   2014-04-23
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：
　　We employ energy, momentum, and time resolved multi-photon photoemission spectroscopy to probe the coherent response of metals at optical frequencies. Although the reflection of light from a metal is considered to be an essentially instantaneous process, photoelectron spectra excited with tunable laser sources are able to select particular components of the response that are subject to long (>20 fs) dephasing times. Specifically, we examine the responses of Cu(111) and Ag(111) surfaces focusing on the three-photon photoemission from their Shockley surface states. The photoemission spectra show contributions from the local fields associated with the interband and excitonic polarizations, in addition to the expected response to the external field. Interferometric pump-probe measurements with <100 as scan resolution reveal the coherent polarization dynamics that drive the three-photon photoemission process.

报告人简介：
　　Hrvoje Petek obtained BS degree in 1980 at MIT, and PhD in 1985 at U. C. Berkeley, both in Chemistry. His PhD research concerned the spectroscopy and dynamics of singlet methylene in the gas phase. As a Postdoctoral Fellow and later Research Associate he worked from 1985 to 1993 at the Institute for Molecular Science, in Japan, where he established a research program on ultrafast isomerization of molecules in supersonic molecular beams. Subsequently, he became a Group Leader at Hitachi Advanced Research Laboratory, in Saitama, Japan, where he initiated his current research on ultrafast surface dynamics. In 2000, he became a Professor of Physics, and later Professor of Chemistry, as well as the co-Director of the Petersen Institute for NanoScience and Engineering at the University of Pittsburgh. His research interests focus on the surface femtochemistry and photocatalysis and ultrafast microscopy of coherent excitations in solids. He is a pioneer in the coherent ultrafast spectroscopy and microscopy of solid-state materials. Petek holds the R. K. Mellon Chair in Physics and Astronomy at the University of Pittsburgh, and a visiting professor in numerous universities throughout Europe and Asia.

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