STRONG CORRELATION EFFECTS ON PHOTO-EXCITED STATES IN SEMICONDOCTORS

半导体中光激发态的强相关效应

• 批准号: 21740232
• 负责人: OHASHI Takuma
• 金额: $ 1.33万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740232/
• 关键词: 物性理論; 半導体物性; 光物性; 強相関電子系; 高性能レーザー; 半導体光物性

Metal insulator transition(exciton Mott transition) and quantum condensation transition in photo-excited semiconductors(electron-hole systems) are very important in the field of both fundamental and applied physics. To correctly understand these phase transitions, proper theoretical treatment of many body effects is essential. In this study, we have theoretically investigated the exciton Mott transition in these systems by means of extensions of the dynamical mean field theory(DMFT). The DMFT is powerful methods to analyze the lattice fermion systems. For the electron-hole system with a small number of excited particles, a continuous model is more suitable than a lattice model. Therefore, we have formulated DMFT for a continuous model and combining this method with the exact diagonalization method, we have determined the phase diagram in the electron-hole systems at low density.

金属绝缘体跃迁（激子莫特跃迁）和光激发半导体（电子空穴系统）中的量子凝聚跃迁在基础物理和应用物理领域都非常重要。为了正确理解这些相变，对许多身体影响进行正确的理论处理至关重要。在本研究中，我们通过动态平均场理论（DMFT）的扩展从理论上研究了这些系统中的激子莫特跃迁。 DMFT 是分析晶格费米子系统的强大方法。对于激发粒子数量较少的电子空穴系统，连续模型比晶格模型更合适。因此，我们将DMFT制定为连续模型，并将该方法与精确对角化方法相结合，确定了低密度电子空穴系统中的相图。

项目成果

Spatial fluctuations of spin and orbital in two-orbital Hubbard model

双轨道哈伯德模型中自旋和轨道的空间涨落

• 发表时间: 2009
• 期刊: Physical Review B 79
• 作者: T.Kita;他2名
• 通讯作者: 他2名

動的クラスタ近似による有限温度モット転移の解析

动态簇近似分析有限温度莫特转变

• 发表时间: 2009
• 作者: 桃井勉;他2名;Y.Tajiri;岩田耕一;大橋琢磨
• 通讯作者: 大橋琢磨