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Dynamic transport characteristics of side-coupled double-quantum-impurity systems |
| Yi-Jie Wang(王一杰) and Jian-Hua Wei(魏建华)† |
| Department of Physics, Renmin University of China, Beijing 100872, China |
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Abstract A systematic study is performed on time-dependent dynamic transport characteristics of a side-coupled double-quantum-impurity system based on the hierarchical equations of motion. It is found that the transport current behaves like a single quantum dot when the coupling strength is low during tunneling or Coulomb coupling. For the case of only tunneling transition, the dynamic current oscillates due to the temporal coherence of the electron tunneling device. The oscillation frequency of the transport current is related to the step voltage applied by the lead, while temperature $T$, electron--electron interaction $U$ and the bandwidth $W$ have little influence. The amplitude of the current oscillation exists in positive correlation with $W$ and negative correlation with $U$. With the increase in coupling $t_{12}$ between impurities, the ground state of the system changes from a Kondo singlet of one impurity to a spin singlet of two impurities. Moreover, lowering the temperature could promote the Kondo effect to intensify the oscillation of the dynamic current. When only the Coulomb transition is coupled, it is found that the two split-off Hubbard peaks move upward and have different interference effects on the Kondo peak at the Fermi surface with the increase in $U_{12}$, from the dynamics point of view.
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Received: 22 December 2021
Revised: 21 April 2022
Accepted manuscript online: 28 April 2022
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PACS:
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73.63.Kv
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(Quantum dots)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11774418 and 11374363). Computational resources were provided by the Physical Laboratory of High Performance Computing at Renmin University of China. |
Corresponding Authors:
Jian-Hua Wei
E-mail: wjh@ruc.edu.cn
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Cite this article:
Yi-Jie Wang(王一杰) and Jian-Hua Wei(魏建华) Dynamic transport characteristics of side-coupled double-quantum-impurity systems 2022 Chin. Phys. B 31 097305
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