第297回 物性セミナー(4研究科共同セミナー:6月28日)



題名: Studies of interface polarization and magnetization dynamics using terahertz emission spectroscopy



講師: Prof. Charles A. Schmuttenmaer

(Department of Chemistry, Yale University)

日時: 2007年6月28日(木) 14:30〜15:45

場所: 先端物質科学研究科 401講義室



アブストラクト:

Much can be learned about charge and magnetization dynamics at surfaces and in nanometer thickness films through the terahertz emission spectroscopy (TES). In some respects, TES is the difference-frequency analog of second harmonic generation (SHG). As such, interface-specific properties contribute to the generation of a THz pulse upon ultrafast optical excitation. In addition, there can be bulk contributions as well, as is also true in SHG. The dependence of THz pulse emission on surface orientation has been used to study carrier dynamics, both real and virtual, in GaAs(111). Magnetization dynamics in magnetic polycrystalline nickel films ranging in thickness from 0.5 nm to 6 nm have also been characterized with TES. Distinct bulk and surface contributions each play a role, and their origins will be discussed.



担当教員:角屋豊(先端物質科学研究科),内線7651



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