Origin of light-induced giant expansion in thallium compounds and its application

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560381
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Osaka Prefecture University
• Principal Investigator: SHIM YongGu 大阪府立大学, 工学(系)研究科(研究院), 助教 (20336803)
• Research Collaborator: MAMEDOV Nazim ; WAKITA Kazuki
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 半導体光物性 / 光物性 / 物性実験 / 物性基礎論

Outline of Final Research Achievements

The purpose of this study is to make quantitative evaluation of the photo-induced local-expansion of the surface relief in thallium ternary compounds. The investigated samples exhibit micrometer order expansion with short response time at low pump beam power of about two orders less than the optical damage threshold. These results indicate that the thallium ternary compounds are promising materials for new light-driven systems. From the result of the simulated calculation for the photo-induced expansion, it is suggested that the local-expansion is due to small thermal conductivity in the thallium compounds. The electronic band structures of some thallium compounds display an abrupt change around the temperatures of the structural phase transitions. It is reasonable to suppose that the giant photo-induced expansion in the thallium ternary compounds is related to the change of physical properties by the structural phase transitions.

Free Research Field

半導体光物性