Phase Control in Spin-Charge-Photon Coupled Systems

自旋电荷光子耦合系统中的相位控制

基本信息

批准号：
08CE2003
负责人：
GONOKAMI Makoto
金额：
$ 1308.8万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for COE Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08CE2003/
关键词：
spin-charge-photon coupled system strongly correlated electron system photoinduced phase transition orbital liquid crystal low-dimensional nonlinear optical response oxide electronics quantum spin system field theory 非線形・高速光応答スピンー電荷-光・結

项目摘要

Electrons in certain solids have strong correlations due to the Coulomb and exchange interactions among them and the electron-lattice interaction. The objective of the Project was to understand the physics of novel phases brought about by the electron correlation and to open up a field of new electronics based on the phase transitions between these phases triggered by weak external stimuli ; among them is photo-excitation. The target materials cover transition metal oxides, organic solids, and semiconductors. Experimental data derived from various techniques including transport, magnetic, and thermal measurements, materials development, laser spectroscopy, and x-ray ellipsometry have been constantly interrogated by the theory group. A strong technical base has been established for high-quality crystal growth and for ultrafast optical spectroscopy ranging from THz to UV. The synergetic collaboration among the Project members have been essential in developing a field of materials science, in which one can discuss the low energy transport phenomena and high energy optical excitation on the common footing ; a particularly relevant aspect for the study of the strongly correlated electron systems. The list of our finding includes the photoinduced insulator-metal transition, the connection between the superconductivity and the metal-insulator transition, the orbital quanta (orbiton), and ultrafast photo-switching. These results will be the basis on which we can establish the electronics for the next generation.The Project has well served as the worldwide center for the study of strongly correlated electron systems. In order to strengthen and extend our activity after the termination of the Project, Quantum-Phase Electronic Center has been established in the School of Engineering, The University of Tokyo in April, 2001.

某些固体中的电子由于库仑和它们之间的交换相互作用以及电子晶体相互作用而具有很强的相关性。该项目的目的是了解电子相关性带来的新阶段的物理学，并根据弱外部刺激触发的这些阶段之间的相变开设新电子领域；其中是照片兴奋。目标材料涵盖过渡金属氧化物，有机固体和半导体。该理论组不断质疑从运输，磁性和热测量，材料开发，激光光谱和X射线椭圆法的各种技术得出的实验数据。已经建立了强大的技术基础，用于高质量的晶体生长和从THZ到UV的超快光谱。项目成员之间的协同合作对于开发材料科学领域至关重要，在该领域中，人们可以在公共基础上讨论低能运输现象和高能光学激发。研究强相关的电子系统的一个特别相关的方面。我们发现的列表包括光诱导的绝缘剂金属过渡，超导性与金属 - 绝缘体跃迁之间的连接，轨道量子（Orbiton）以及超快的照相开关。这些结果将是我们可以为下一代建立电子产品的基础。该项目已很好地充当了强烈相关的电子系统研究中心。为了在项目终止后加强和扩展我们的活动，2001年4月在东京大学工程学院建立了量子相电子中心。