Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference

doi:10.1088/1674-1056/26/6/067501

中国物理B ›› 2017, Vol. 26 ›› Issue (6): 67501-067501.doi: 10.1088/1674-1056/26/6/067501

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference

Yong-Chen Xiong(熊永臣), Wang-Huai Zhou(周望怀), Jun Zhang(张俊), Nan Nan(南楠)

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

收稿日期:2017-01-03 修回日期:2017-03-24 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: Yong-Chen Xiong E-mail:xiongyc_lx@huat.edu.cn
基金资助:
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).

Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference

Yong-Chen Xiong(熊永臣)^1,2, Wang-Huai Zhou(周望怀)¹, Jun Zhang(张俊)¹, Nan Nan(南楠)¹

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

Received:2017-01-03 Revised:2017-03-24 Online:2017-06-05 Published:2017-06-05
Contact: Yong-Chen Xiong E-mail:xiongyc_lx@huat.edu.cn
Supported by:
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).

摘要/Abstract

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 Rayleigh-Schrödinger perturbation theory is used.

关键词: double dot Structure, Kosterlitz-Thouless transition, numerical renormalization group, strongly correlated effect

Abstract:

Key words: double dot Structure, Kosterlitz-Thouless transition, numerical renormalization group, strongly correlated effect

中图分类号: (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)

75.20.Hr

73.63.Kv (Quantum dots) 71.27.+a (Strongly correlated electron systems; heavy fermions)

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.

Yong-Chen Xiong(熊永臣), Wang-Huai Zhou(周望怀), Jun Zhang(张俊), Nan Nan(南楠). Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference[J]. Chin. Phys. B, 2017, 26(6): 67501-067501.

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Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference

Kosterlitz-Thouless transition, spectral property and magnetic moment for a two-dot structure with level difference

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