| Project/Area Number |
24540396
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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 |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Ochanomizu University |
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Principal Investigator |
DEGUCHI Tetsuo お茶の水女子大学, 大学院人間文化創成科学研究科, 教授 (70227544)
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| Co-Investigator(Renkei-kenkyūsha) |
KUDO Kazue お茶の水女子大学, 大学院人間文化創成科学研究科, 准教授 (30505574)
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| Research Collaborator |
SATO Jun 東京大学, 先端科学技術研究センター, 助教 (10735723)
KAMINISHI Eriko 東京大学, 大学院理学研究科, PD研究員
YAHAGI Ryoko お茶の水女子大学, 大学院人間文化創成科学研究科
GIRI Pulak Ranjan お茶の水女子大学, 大学院人間文化創成科学研究科, 日本学術振興会外国人特別研究員
HATAKEYAMA Ryoko 東京大学, 大学院理学系研究科
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 可積分量子系 / 量子多体系 / 量子統計力学 / 量子ダイナミクス / 非平衡 / 典型性 / 量子ハイゼンベルグ鎖 / 代数的ベーテ仮設 / 量子ＸＸＸ鎖 / 近藤問題 / 非平衡ダイナミクス / ＸＸＸ模型 / 形状因子 / ウイルソン比 / 近藤効果 / 物性基礎論 / 統計力学 / 数理物理 / 再帰性 / エルゴ―ド性 |
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| Outline of Final Research Achievements |
Non-equilibrium dynamics of isolated quantum many-body systems has recently attracted much attention. Collective oscillation of bunches of bosons was observed in the one-dimensional (1D) isolated quantum many-body systems of bosons thanks to the development of cold atomic experiments in the last decade. In the present research, we have studied how thermalization or more precisely equilibration occurs and shown recurrence phenomena in the dynamics of the 1D Bose gas with repulsive delta-function interaction. We also studied equilibration in the 1D quantum Heisenberg model, i.e., the XXX spin chain. For the 1D Bose gas, we constructed a quantum state with a localized density profile very close to that of a dark soliton of the GP equation, by superposing one-hole excitations. For the XXX spin chain, we derived some features of string solutions for the Bethe-ansatz equations. Furthermore, we obtained an exact solution for the XXZ spin chain with an impurity and evaluated its Wilson ratio.
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