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.

阐明了以拓扑结构变化和一级跃迁邻近效应为特征的新量子临界性的本质，包括边缘量子临界性和量子多临界性。揭示了多临界点附近零波数涨落的发散是几种前所未有的非费米液体性质的起源。零能隙半导体与拓扑绝缘体之间的量子相变具有自发对称性破缺和拓扑变化的双重特征，从而表现出新颖的临界性。阐明了临界量子态产生高温超导的机制。

项目成果

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

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

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

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

第一原理電子状態計算法をもとにした高温超伝導体にたいする電子状態計算

基于第一性原理电子态计算方法的高温超导体电子态计算

• 作者: 三澤 貴宏;今田 正俊
• 通讯作者: 今田 正俊