Nonlinear Kondo transport through serially coupled double quantum dots

被引:0
作者
Cheng, Yongxi [1 ,2 ,3 ,4 ,5 ]
Gao, Jie [6 ]
Liao, Yuan [7 ]
Li, Zhenhua [3 ,4 ,5 ]
Wei, Jianhua [8 ]
Yan, Yijing [9 ]
机构
[1] Taiyuan Inst Technol, Dept Sci, Taiyuan 030008, Peoples R China
[2] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China
[3] Lanzhou Univ, Lanzhou Ctr Theoret Phys, Lanzhou 730000, Peoples R China
[4] Lanzhou Univ, Key Lab Quantum Theory & Applicat MOE, Lanzhou 730000, Peoples R China
[5] Lanzhou Univ, Key Lab Theoret Phys Gansu Prov, Lanzhou 730000, Peoples R China
[6] North Univ China, Sch Semicond & Phys, Taiyuan 030051, Peoples R China
[7] Taiyuan Normal Univ, Dept Phys, Taiyuan 030606, Peoples R China
[8] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
[9] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Hefei 230026, Peoples R China
关键词
SYSTEMS;
D O I
10.1063/5.0240691
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We study the transport property through the serially coupled double quantum dots (DQDs) system with Kondo resonance based on the dissipation equation of motion theory. A nonlinear behavior of the transport current is exhibited due to the competition between the interdot coupling strength of the two QDs and the Kondo effect. With the increase in interdot coupling strength, the transport current first increases at low interdot couplings and then decreases with the strong interdot couplings. The reason is that the interdot coupling strength will result in a continuous evolution from the Kondo singlet state of individual QDs to the spin singlet state forming between the two QDs. Moreover, we define the physical quantity partial derivative G/partial derivative t as the differential function of differential conductance G with respect to interdot coupling strength t. The nonlinear transport behavior and the physical quantity partial derivative G/partial derivative t with differential conductance at different bias voltages can be used to detect the potential Kondo resonance in the nonequilibrium transport experiments.
引用
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页数:8
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