Chiral splitting of Kondo peak in triangular triple quantum dot

doi:10.1088/1674-1056/ac29a5

中国物理B ›› 2022, Vol. 31 ›› Issue (5): 57201-057201.doi: 10.1088/1674-1056/ac29a5

Chiral splitting of Kondo peak in triangular triple quantum dot

Yi-Ming Liu(刘一铭)¹, Yuan-Dong Wang(王援东)², and Jian-Hua Wei(魏建华)^1,†

1 Department of Physics, Renmin University of China, Beijing 100872, China;
2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2021-07-08 修回日期:2021-09-02 发布日期:2022-04-09
通讯作者: Jian-Hua Wei,E-mail:wjh@ruc.edu.cn E-mail:wjh@ruc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.11774418,11374363,and 21373191).

Chiral splitting of Kondo peak in triangular triple quantum dot

Yi-Ming Liu(刘一铭)¹, Yuan-Dong Wang(王援东)², and Jian-Hua Wei(魏建华)^1,†

1 Department of Physics, Renmin University of China, Beijing 100872, China;
2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-07-08 Revised:2021-09-02 Published:2022-04-09
Contact: Jian-Hua Wei,E-mail:wjh@ruc.edu.cn E-mail:wjh@ruc.edu.cn
About author:2021-9-24
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.11774418,11374363,and 21373191).

摘要/Abstract

摘要： New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. In the absence of magnetic field, TTQD has four-fold degenerate chiral ground states with degenerate spin chirality. When a perpendicular magnetic field is applied, the chiral interaction is induced by the magnetic flux threading through TTQD and the four-fold degenerate states split into two chiral state pairs. The chiral excited states manifest as chiral splitting of the Kondo peak in the spectral function. The theoretical analysis is confirmed by the numerical computations. Furthermore, under a Zeeman magnetic field B, the chiral Kondo peak splits into four peaks, owing to the splitting of spin freedom. The influence of spin chirality on the Kondo effect signifies an important role of the phase factor. This work provides insight into the quantum transport of strongly correlated electronic systems.

关键词: Kondo effect, quantum dot, chiral splitting

Abstract: New characteristics of the Kondo effect, arising from spin chirality induced by the Berry phase in the equilibrium state, are investigated. The analysis is based on the hierarchical equations of motion (HEOM) approach in a triangular triple quantum-dot (TTQD) structure. In the absence of magnetic field, TTQD has four-fold degenerate chiral ground states with degenerate spin chirality. When a perpendicular magnetic field is applied, the chiral interaction is induced by the magnetic flux threading through TTQD and the four-fold degenerate states split into two chiral state pairs. The chiral excited states manifest as chiral splitting of the Kondo peak in the spectral function. The theoretical analysis is confirmed by the numerical computations. Furthermore, under a Zeeman magnetic field B, the chiral Kondo peak splits into four peaks, owing to the splitting of spin freedom. The influence of spin chirality on the Kondo effect signifies an important role of the phase factor. This work provides insight into the quantum transport of strongly correlated electronic systems.

Key words: Kondo effect, quantum dot, chiral splitting

中图分类号: (Scattering mechanisms and Kondo effect)

72.15.Qm

73.21.La (Quantum dots) 73.23.-b (Electronic transport in mesoscopic systems)

Yi-Ming Liu(刘一铭), Yuan-Dong Wang(王援东), and Jian-Hua Wei(魏建华). Chiral splitting of Kondo peak in triangular triple quantum dot[J]. 中国物理B, 2022, 31(5): 57201-057201.

Yi-Ming Liu(刘一铭), Yuan-Dong Wang(王援东), and Jian-Hua Wei(魏建华). Chiral splitting of Kondo peak in triangular triple quantum dot[J]. Chin. Phys. B, 2022, 31(5): 57201-057201.

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Chiral splitting of Kondo peak in triangular triple quantum dot

Chiral splitting of Kondo peak in triangular triple quantum dot

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