Zero-energy modes in serially coupled double quantum dots

doi:10.1088/1674-1056/ab8378

中国物理B ›› 2020, Vol. 29 ›› Issue (6): 67302-067302.doi: 10.1088/1674-1056/ab8378

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

Zero-energy modes in serially coupled double quantum dots

Fu-Li Sun(孙复莉), Zhen-Hua Li(李振华), Jian-Hua Wei(魏建华)

1 Department of Physics & Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

收稿日期:2020-02-23 修回日期:2020-03-23 出版日期:2020-06-05 发布日期:2020-06-05
通讯作者: Jian-Hua Wei E-mail:wjh@ruc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418 and 11374363).

Zero-energy modes in serially coupled double quantum dots

Fu-Li Sun(孙复莉)¹, Zhen-Hua Li(李振华)², Jian-Hua Wei(魏建华)¹

1 Department of Physics & Beijing Key Laboratory of Optoelectronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

Received:2020-02-23 Revised:2020-03-23 Online:2020-06-05 Published:2020-06-05
Contact: Jian-Hua Wei E-mail:wjh@ruc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418 and 11374363).

摘要/Abstract

摘要： We investigate symmetrically coupled double quantum dots via the hierarchical equations of motion method and propose a novel zero-energy mode (ZEM) at a temperature above the spin singlet-triplet transition temperature. Owing to the resonance of electron quasi-particle and hole quasi-particle, ZEM has a peak at ω=0 in the spectral density function. We further examine the effect of the magnetic field on the ZEM, where an entanglement of spin and charge has been determined; therefore, the magnetic field can split the ZEM in the spectra.

关键词: zero-energy mode, quantum dot, temperature

Abstract: We investigate symmetrically coupled double quantum dots via the hierarchical equations of motion method and propose a novel zero-energy mode (ZEM) at a temperature above the spin singlet-triplet transition temperature. Owing to the resonance of electron quasi-particle and hole quasi-particle, ZEM has a peak at ω=0 in the spectral density function. We further examine the effect of the magnetic field on the ZEM, where an entanglement of spin and charge has been determined; therefore, the magnetic field can split the ZEM in the spectra.

Key words: zero-energy mode, quantum dot, temperature

中图分类号: (Quantum dots)

73.21.La

73.63.Kv (Quantum dots) 74.62.-c (Transition temperature variations, phase diagrams)

孙复莉, 李振华, 魏建华. Zero-energy modes in serially coupled double quantum dots[J]. 中国物理B, 2020, 29(6): 67302-067302.

Fu-Li Sun(孙复莉), Zhen-Hua Li(李振华), Jian-Hua Wei(魏建华). Zero-energy modes in serially coupled double quantum dots[J]. Chin. Phys. B, 2020, 29(6): 67302-067302.

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Zero-energy modes in serially coupled double quantum dots

Zero-energy modes in serially coupled double quantum dots

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