Physics of Quantum Phase Transitions - Topological Quantum Criticality, Quantum Multi-Criticality and Novel Quantum Phases

量子相变物理学 - 拓扑量子临界性、量子多临界性和新型量子相

• 批准号: 22340090
• 负责人: IMADA Masatoshi
• 金额: $ 9.32万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340090/
• 关键词: 量子臨界現象; 非フェルミ液体; トポロジカル相転移; モット転移; マージナル量子臨界

Nature of novel quantum criticality including marginal quantum criticality and quantum multi-criticality characterized by topology changes as well as proximity effects of first-order transitions were clarified. It was revealed that the divergence of the fluctuations at zero wave number generated around the multi-critical points is the origin of several unprecedented non-Fermi liquid properties. Quantum phase transitions between zero-gap semiconductors and topological insulators are shown to have dual characters of spontaneous symmetry breaking and topology change and thus show novel criticality. We have elucidated the mechanism of high-temperature superconductivity generated by the marginal quantum criticality.

阐明了新型量子关键性的性质，包括以拓扑变化以及一阶转变的接近效应为特征的边缘量子临界性和量子多临界性。据揭示，在多临界点周围产生的零波数的波动的差异是几种前所未有的非Fermi液体特性的起源。零间隙半导体和拓扑绝缘子之间的量子相变为自发对称性破坏和拓扑变化的双重特征，从而显示出新的关键性。我们已经阐明了边缘量子关键性产生的高温超导性的机制。

项目成果

Two Families of Superconductors, Cuprates and Iron-Based Superconductors

两个超导体家族：铜基超导体和铁基超导体

• 发表时间: 2010
• 作者: T.Sugawara;N.Kimura;H.Aoki;M. Imada
• 通讯作者: M. Imada

Superconductivity in Ab initio Low-Energy Model for Iron-Based Superconductors

铁基超导体从头算低能模型中的超导性

• 发表时间: 2014
• 作者: Takahiro Misawa;Masatoshi Imada
• 通讯作者: Masatoshi Imada

Theory of pseudogap and superconductivity in doped Mott insulators

• DOI: 10.1002/andp.201100028
• 发表时间: 2011-07
• 期刊: Annalen der Physik
• 影响因子: 2.4
• 作者: M. Imada;Y. Yamaji;Shiro Sakai;Y. Motome

Improved Multi-Variable Variational Monte Carlo Method Examined by High-Precision Calculations of One-Dimensional Hubbard Model

一维哈伯德模型高精度计算检验改进的多变量变分蒙特卡罗方法

• DOI: 10.1088/1742-6596/454/1/012046
• 发表时间: 2013
• 期刊: J. Phys. Conf. Ser.
• 作者: Ryui Kaneko;Satoshi Morita;Masatoshi Imada
• 通讯作者: Masatoshi Imada

High-temperature superconductivity in layered nitrides β-LixMNCl (M = Ti, Zr, Hf): Insights from density functional theory for superconductors

• DOI: 10.1103/physrevb.86.054513
• 发表时间: 2012-08-20
• 期刊: PHYSICAL REVIEW B
• 影响因子: 3.7
• 作者: Akashi, Ryosuke;Nakamura, Kazuma;Imada, Masatoshi
• 通讯作者: Imada, Masatoshi