Phase Control in Spin-Charge-Photon Coupled Systems

自旋电荷光子耦合系统中的相位控制

• 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

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它们之间的库仑相互作用和交换相互作用以及电子-晶格相互作用而具有很强的相关性。该项目的目标是了解电子相关性带来的新相的物理原理，并基于弱外部刺激触发的这些相之间的相变开辟新电子学领域；其中包括光激发。目标材料涵盖过渡金属氧化物、有机固体和半导体。理论小组不断询问来自输运、磁和热测量、材料开发、激光光谱和 X 射线椭圆测量等各种技术的实验数据。已经为高质量晶体生长和从太赫兹到紫外的超快光谱建立了强大的技术基础。项目成员之间的协同合作对于材料科学领域的发展至关重要，在该领域中，人们可以在共同的基础上讨论低能输运现象和高能光学激发；对于强相关电子系统的研究来说，这是一个特别相关的方面。我们的发现包括光致绝缘体-金属转变、超导性与金属-绝缘体转变之间的联系、轨道量子（轨道）和超快光切换。这些结果将成为我们建立下一代电子学的基础。该项目已成为强相关电子系统研究的全球中心。为了在项目终止后加强和扩展我们的活动，量子相电子中心于2001年4月在东京大学工学院成立。

项目成果

J.D.Zhang: "Jahn-Teller phonon anomaly and dynamic phase fluctuations in La_<0.7>Ca_<0.3>MnO_3"Phys.Rev.Lett.. 86. 3823-2826 (2001)

J.D.Zhang：“La_<0.7>Ca_<0.3>MnO_3 中的 Jahn-Teller 声子异常和动态相位涨落”Phys.Rev.Lett.. 86. 3823-2826 (2001)

Y.J.Wang: "Structural critical scattering study of Mg-doped CugeO_3."Phys.Rev.Letts.. 83. 1676 (1999)

Y.J.Wang：“Mg掺杂CugeO_3的结构临界散射研究”。Phys.Rev.Letts.. 83. 1676 (1999)

M.Fiebig: "Visualization of switching of the local insulator-metal transition in Pr_<0.7>Ca_<0.3>MnO_3"J.Appl.Phys.. 85. 5561-5563 (1999)

M.Fiebig：“Pr_<0.7>Ca_<0.3>MnO_3 中局部绝缘体-金属转变的可视化”J.Appl.Phys.. 85. 5561-5563 (1999)

Y.Nakazawa: "Low-Temperature Specific Heat of k-(BEDT-TTF)2Cu[N(CN)2]Br in the Superconducting State" Phys.Rev.B55. R8670-R8673 (1997)

Y.Nakazawa：“超导状态下 k-(BEDT-TTF)2Cu[N(CN)2]Br 的低温比热”Phys.Rev.B55。

K.Miyagawa: "13C-NMR Nesting Instability in a-(BEDT-TTF)2RbHg(SCN)4" Phys.Rev.B56. R8487-R8490 (1997)

K.Miyakawa：“a-(BEDT-TTF)2RbHg(SCN)4 中的 13C-NMR 嵌套不稳定性”Phys.Rev.B56。