Exploration of material instability under illumination

2015 Fiscal Year Final Research Report

• Project/Area Number: 26610087
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: Wakayama University
• Principal Investigator: SHINOZUKA Yuzo 和歌山大学, システム工学部, 教授 (30144918)
• Co-Investigator(Kenkyū-buntansha): YAMAKADO Hideo 和歌山大学, システム工学部, 准教授 (30242035)
• Co-Investigator(Renkei-kenkyūsha): ITOH Chihiro 和歌山大学, システム工学部, 教授 (60211744)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 嫌光性 / 光誘起構造変化 / 断熱不安定性 / ジアセチレン / フォトクロミズム / 低次元物質 / 励起子

Outline of Final Research Achievements

We have studied theoretically and experimentally on material instability under illumination. Targets are low dimensional materials, where fundamental electronic excitations, excitons, are automatically self-trapped. We have found the followings:
1) Second exciton creation with a smaller energy is possible in during the lattice relaxation caused by a first exciton creation. 2) New type of alloys phenazine-(TCNQ1-x FTCNQx) are successfully synthesized. Although x=0.4 alloy shows the same crystal structure as of x=0 and 1.0, alloys with x=0.6 show molecular dimerization. 3) Single crystal diacetylene has been found to show structural changes accompanied by symmetry changes, suggesting structural instability might depend on conformation of side chains.

Free Research Field

物性理論