2013 Fiscal Year Final Research Report

Ultrafast lattice dynamics studied by femtosecond time-resolved electron diffraction

Research Project

Project/Area Number	23684018
Research Category	Grant-in-Aid for Young Scientists (A)
Allocation Type	Single-year Grants
Research Field	Condensed matter physics I
Research Institution	The University of Tokyo
Principal Investigator	SHIMOJIMA Takahiro 東京大学, 工学(系)研究科(研究院), 助教 (70581578)
Project Period (FY)	2011-04-01 – 2013-03-31
Keywords	時間分解電子線回折 / 構造相転移 / レーザー
Research Abstract	We constructed the ultrafast electron diffraction system. We obtained the electron diffraction images of HOPG or mica by using photocathode electron gun in the transmission and reflection geometries. In the transmission geometry, we successfully obtained the time-resolved signal from the Bragg spots of thin Au single crystals, which decreases within 10 ps. We also measured the IrTe2 which shows the decay of the Bragg spot intensity within 2ps, indicative of the electron-phonon coupling stronger than that of gold. At the same time, total time resolution of this system was estimated to be better than 2ps. Investigation on the iron-based superconductors are now in progress.