| Project/Area Number |
25400377
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Hiroshima University |
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Principal Investigator |
Tanaka Arata 広島大学, 先端物質科学研究科, 助教 (70253052)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 強相関電子系 / 軌道秩序 / 高エネルギー分光 / 動的平均場理論 / 共鳴軟X線弾性散乱 / デュアルフェルミオン法 / 金属絶縁体転移 / ハバードモデル / 電子相関 / 動平均場近似 / 動的平均場近似 / Dual Fermion法 / 軟X線共鳴回折 / 遷移金属化合物 / 軌道縮退 |
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| Outline of Final Research Achievements |
Strongly correlated electron systems have long been studied because of their fascinating features such as high-temperature superconductance or magnetism. In recent years, the dynamical mean-field theory (DMFT) has attracted attentions as it can render accurate descriptions of such strongly correlated systems. In this study, we developed new calculation techniques and a computer program, which can calculate spectral functions as well as ground state properties of strongly correlated electron systems accurately, based on the dual-fermion method, an extension of DMFT. We investigated the metal-insulator transition in the Hubbard model, which is one of the fundamental models of strongly correlated electron systems. We also discussed soft x-ray resonant diffraction and high-energy spectroscopy as a means to observe orbital orders and conducted analyses of the spectra in materials with orbital orders.
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