1995 Fiscal Year Final Research Report Summary
Physics of Low Dimensional Electron Systems
| Project/Area Number |
05640411
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | Osaka University (1995)
Kyoto University (1993-1994) |
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Principal Investigator |
KAWAKAMI Norio Osaka University, Dept.of Material and Life Science, Professor, 工学部, 教授 (10169683)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAOKA Yosuke Kyoto University, Yukawa Inst.for Theoretical Physics, Professor, 基礎物理学研究所, 教授 (60022539)
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| Project Period (FY) |
1993 – 1995
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| Keywords | Low-dimensional systems / Exact solution / Conforaml field theory / Randomness / Mesoscopic Systems |
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| Research Abstract |
In this research project, we have studied the effect of electron correlations on low-dimensional electron systems, and have applied the obtained results to explain some experimental findings. In particular, we have used the methods of exact solution and conformal field theory (CFT). We briefly summarize the obtained results.
(1) Electron systems with ladder structure :
In order to understand characteristic properties of the oxide compounds Sr_<n-1>Cu_<n+1>O_<2n>, we have studied the coupled Hubbard chain by means of bosonization techniques.
(2) Critical properties of impurity systems :
By using the exact solution of the Kondo effect and CFT,we have studied the critical behavior of impurity systems. Two kinds of critical exponents have been found, which characterize the Fermi liquid and the orthogonality catastrophe.
(3) Multi-band effects on 1D electron systems :
The one-dimensional supersymmetric t-J model with two-band structure has been studied by using the exact solution and CFT.The two-band effect on the Mott insulator has been clarified.
(4) Transport coefficients in exclusion statistics :
We have calculated transport coefficients for many-particle systems obeying exclusion statistics. We have obtained the relation of the statistical interaction to transport coefficients.
(5) Conductance fluctuations in quantum wires :
The conductance fluctuations in mesoscopic quantum wires have been investigated. In the strongly localized regime, the conductance fluctuation can be explained by resonance tunneling.
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