Fano Effect and Spin-Polarized Transport in a Triple-Quantum-Dot Interferometer Attached to Two Ferromagnetic Leads
Jiyuan Bai1, Kongfa Chen2*, Pengyu Ren1, Jianghua Li1, Zelong He1*, and Li Li3
1School of Electronic and Information Engineering, Yangtze Normal University, Chongqing 408003, China 2College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China 3Key Lab of In-fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China
Abstract：We report the conductance and average current through a triple-quantum-dot interferometer coupled with two ferromagnetic leads using the nonequilibrium Green's function. The results show that the interference between the resonant process and the non-resonant process leads to the formation of Fano resonance. More Fano resonances can be observed by applying a time-dependent external field. As a Zeeman magnetic field is applied, the spin-up electron transport is depressed in a certain range of electron energy levels. A spin-polarized pulse device can be realized by adjusting the spin polarization parameters of ferromagnetic leads. Moreover, the $I$–$V$ characteristic curves show that under the influence of Fano resonance, the spin polarization is significantly enhanced by applying a relatively large reverse bias voltage. These results strongly suggest that the spin-polarized pulse device can be potentially applied as a spin-dependent quantum device.
. [J]. 中国物理快报, 2020, 37(12): 127301-.
Jiyuan Bai, Kongfa Chen, Pengyu Ren, Jianghua Li, Zelong He, and Li Li. Fano Effect and Spin-Polarized Transport in a Triple-Quantum-Dot Interferometer Attached to Two Ferromagnetic Leads. Chin. Phys. Lett., 2020, 37(12): 127301-.
2020, Vol. 37 
