Theoretical study of spontaneous symmetry breaking of Fermi surface

费米面自发对称破缺的理论研究

• 批准号: 22740238
• 负责人: YAMASE Hiroyuki
• 金额: $ 2.58万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22740238/
• 关键词: 物性理論; 金属物性; 強相関電子系; 光物性; フェルミ面; ネマチック; 強磁性; 繰り込み群; 自発的対称性の破れ; 物理理論; 量子臨界性; くりこみ群

The spontaneous symmetry breaking of the Fermi surface is a new concept found in theory. This symmetry breaking is inferred from recent experiments for bi-layered ruthenates and iron-based and cuprate high-temperature superconductors. Motivated by these experiments we studied the competition with ferromagnetism and other charge orders, a superconducting mechanism due to fluctuations of the orientational symmetry breaking, and Raman scattering which can detect such fluctuations directly. Effects of the fluctuations were explored further by employing a functional renormalization group scheme and scaling theory and we proposed an experimental test for a general property near the phase transition. Ferromagnetic fluctuations were also studied in terms of a functional renormalization group. Finally we achieved a non-perturbative analysis of the one-particle excitation spectrum near the Fermi surface symmetry breaking.

费米面的自发对称破缺是理论上的一个新概念。这种对称性破缺是从最近的实验中推断出的双层超导体和铁基和铜酸盐高温超导体。受这些实验的启发，我们研究了与铁磁性和其他电荷序的竞争，由于取向对称性破缺的波动的超导机制，以及可以直接检测这种波动的拉曼散射。通过采用泛函重整化群方案和标度理论进一步探讨了波动的影响，并提出了相变附近的一般性质的实验测试。还研究了铁磁涨落的功能重整化群。最后，我们对费米面对称性破缺附近的单粒子激发谱进行了非微扰分析。

项目成果

Van Hove特異点近傍での強磁性転移と超伝導

范霍夫奇点附近的铁磁转变和超导

• 发表时间: 2012
• 作者: 山瀬博之;Andrey Katanin;Valentin Irkhin
• 通讯作者: Valentin Irkhin

Fermi-surface truncation from thermal nematic fluctuations

热向列涨落造成的费米面截断

• 发表时间: 2012
• 期刊: Phys. Rev. Lett.
• 作者: H. Yamase;W. Metzner
• 通讯作者: W. Metzner

Nematic quantum criticality without order

无序向列量子临界

• 发表时间: 2011
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: H.Yamase;P.Jakubczyk;W.Metzner
• 通讯作者: W.Metzner

NIMS Condensed Matter Theory (Hiroyuki Yamase)

NIMS 凝聚态理论（Hiroyuki Yamase）

Addenda : van Hove singularity and spontaneous Fermi surface symmetry breaking in Sr3Ru2O7

附录：Sr3Ru2O7 中的范霍夫奇点和自发费米表面对称性破缺

• 发表时间: 2010
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: H.Yamase;A.A.Katanin
• 通讯作者: A.A.Katanin