| Kosterlitz–Thouless transition,spectral property and magnetic moment for a two-dot structure with level difference |
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| 引用本文： | 熊永臣,周望怀,张俊,南楠.Kosterlitz–Thouless transition,spectral property and magnetic moment for a two-dot structure with level difference[J].中国物理 B,2017,26(6):67501-067501. |
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| 作者姓名： | 熊永臣 周望怀 张俊 南楠 |
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| 作者单位： | 1.School of Science and Advanced Functional Material and Photoelectric Technology Research Institution, Hubei University of Automotive Technology, Shiyan 442002, China;2.Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Republic of Singapore |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No. 11504102), the Special Fund for Theoretical Physics of the National Natural Science Foundation of China (Grant No. 11647133), the Doctoral Scientific Research Foundation of China (Grant No. BK201407), and the Major Scientific Research Project Pre-funds of Hubei University of Automotive Technology, China (Grant No. 2014XY06). |
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| 摘 要： | By means of the numerical renormalization group method, we study the phase transition, the spectral property, and the temperature-dependent magnetic moment for a parallel double dot system with level difference, where the dot energies are kept symmetric to the half-filled level. A Kosterlitz–Thouless(KT) transition between local spin triplet and singlet is found. In the triplet regime, the local spin is partially screened by the conduction leads and spin-1 Kondo effect is realized.While for the singlet, the Kondo peak is strongly suppressed and the magnetic moment decreases to 0 at a definite low temperature. We attribute this KT transition to the breaking of the reflection symmetry, resulting from the difference of the charge occupations of the two dots. To understand this KT transition and related critical phenomena, detailed scenarios are given in the transmission coefficient and the magnetic moment, and an effective Kondo model refers to the RayleighSchrdinger perturbation theory is used.
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| 收稿时间： | 2017-01-03 |
Kosterlitz-Thouless transition,spectral property and magnetic moment for a two-dot structure with level difference |
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| Institution: | 1.School of Science and Advanced Functional Material and Photoelectric Technology Research Institution, Hubei University of Automotive Technology, Shiyan 442002, China;2.Department of Physics, Faculty of Science, National University of Singapore, Singapore 117551, Republic of Singapore |
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| Abstract: | By means of the numerical renormalization group method, we study the phase transition, the spectral property, and the temperature-dependent magnetic moment for a parallel double dot system with level difference, where the dot energies are kept symmetric to the half-filled level. A Kosterlitz-Thouless (KT) transition between local spin triplet and singlet is found. In the triplet regime, the local spin is partially screened by the conduction leads and spin-1 Kondo effect is realized. While for the singlet, the Kondo peak is strongly suppressed and the magnetic moment decreases to 0 at a definite low temperature. We attribute this KT transition to the breaking of the reflection symmetry, resulting from the difference of the charge occupations of the two dots. To understand this KT transition and related critical phenomena, detailed scenarios are given in the transmission coefficient and the magnetic moment, and an effective Kondo model refers to the Rayleigh-Schrödinger perturbation theory is used. |
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| Keywords: | double dot Structure Kosterlitz-Thouless transition numerical renormalization group strongly correlated effect |
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