Theoretical study of spontaneous symmetry breaking of Fermi surface
| Project/Area Number |
22740238
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
YAMASE Hiroyuki 独立行政法人物質・材料研究機構, 超伝導物性ユニット, 主任研究員 (10342867)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 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 |
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| Research Abstract |
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.
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Report
(4 results)
Research Products
(43 results)
