Observation of ultrafast atomic motions with photoexcitation – Photomanipulation of electron orbitals and atomic bonds
July 28(Sat), 2018
A collaborative research group consisting of Shin-ichiro Ideta, a researcher with the Research Fellowship for Young Scientists program at the Japan Society for the Promotion of Science (at the time of the research), Takahiro Shimojima, an assistant professor (at the time of the research), and Kyoko Ishizaka, a professor, all from the School of Engineering at the University of Tokyo, along with a research group consisting of Hiroyuki Ishii, a graduate student, Kazutaka Kudo, an associate professor, and Minoru Nohara, a professor, all from the Research Institute for Interdisciplinary Science, Okayama University, and the research group of Max Planck Institute for the Structure and Dynamics of Matter (Germany), successfully observed the unusual ultrafast atomic motions by using ultrafast electron diffraction. This experimental technique allows us to take stroboscopic photos of the atomic motions in ultrafast time scale, by using electron pulses created by laser and obtaining the time-resolved electron diffraction images of materials. The research group successfully observed the ultrafast atomic motions of iridium ditelluride (IrTe2) which has particular atomic bonding and crystal structures. This research uncovered for the first time that the peculiar distortion of the crystal structure due to strong iridium bonding dissolves and recovers in an unexpected ultrafast time scale, when specific iridium orbitals are directly photoexcited. This accomplishment should expand researches on exploring ultrafast switching and manipulation of atomic bonding that could lead to the development of optical memory devices in the future.
This work will be published in the American scientific magazine Science Advances on July 27, 2018 (Eastern Daylight Saving Time in the U.S.).
This work was supported by research funding from the Tokyo University of Science as well as funding from the Research Fellowship for Young Scientists Program B (15K17709) of The Japan Society for the Promotion of Science.
Journal: Science Advances
Authors: Shin-ichiro Ideta, Dongfang Zhang, Arend G. Dijkstra, Sergey Artyukhin, Sercan Keskin, Roberto Cingolani, Takahiro Shimojima, Kyoko Ishizaka, Hiroyuki Ishii, Kazutaka Kudo, Minoru Nohara and R. J. Dwayne Miller
Title: Ultrafast Dissolution and Creation of Bonds in IrTe2 Induced by Photodoping
Year of Publication: 2018
Okayama University Silicon Valley Office (OUSVO)
Contact: Mototaka Senda, Ph.D.