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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 |
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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.
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Received: 23 February 2020
Revised: 23 March 2020
Accepted manuscript online:
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PACS:
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73.21.La
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(Quantum dots)
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73.63.Kv
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(Quantum dots)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418 and 11374363). |
Corresponding Authors:
Jian-Hua Wei
E-mail: wjh@ruc.edu.cn
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Cite this article:
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 2020 Chin. Phys. B 29 067302
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