2009 Fiscal Year Final Research Report
Competition and cooperation between the bond change and the frustration in low-dimensional quantum spin systems
| Project/Area Number |
18540340
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OKAMOTO Kiyomi Tokyo Institute of Technology, 大学院・理工学研究科, 助教 (10114860)
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| Co-Investigator(Kenkyū-buntansha) |
TONEGAWA Takashi 福井工業大学, 工学部, 教授 (80028167)
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| Project Period (FY) |
2006 – 2009
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| Keywords | 磁性 / 量子スピン / 量子相転移 / フラストレーション / 競合相互作用 / ボンド変化 / 低次元系 / 磁化プラトー |
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| Research Abstract |
We investigated one-dimensional quantum spin systems with bond changes and frustrations. The models we treated were : distorted diamond type spin chain, isosceles triangle spin tube, S=1 and S=2 alternating spin chain, S=1 spin chain with frustrations, anomalies of susceptibility and specific heat of spin gap system in finite magnetic field, and so on. We used the exact solution, perturbation method, numerical diagonalization and density matrix renormalization group.
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