Coulomb interactions-induced perfect spin-filtering effect in a quadruple quantum-dot cell

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:440

Article; Proceedings Paper

Kagan, M. Yu.^1,2  Val'kov, V. V.³  Aksenov, S. V.³ 

[1] RAS, PL Kapitza Inst Phys Problems, Moscow 119334, Russia

[2] Natl Res Univ, Higher Sch Econ, Moscow 101000, Russia

[3] RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia

关键词: Spin filter;    Quantum interference;    Fano-Feshbach resonance;    Coulomb correlations;   

DOI  :  10.1016/j.jmmm.2016.12.106

来源: Elsevier

【 摘 要 】

A quadruple quantum-dot (QQD) cell is proposed as a spin filter. The transport properties of the QQD cell were studied in linear response regime on the basis of the equations of motion for retarded Green's functions. The developed approach allowed us to take into account the influence of both intra-and interdot Coulomb interactions on charge carriers' spin polarization. It was shown that the presence of the insulating bands in the conductance due to the Coulomb correlations results in the emergence of spin-polarized windows (SPWs) in magnetic field leading to the high spin polarization. We demonstrated that the SPWs can be effectively manipulated by gate fields and considering the hopping between central dots in both isotropic and anisotropic regimes.

【 授权许可】

Free