Effect of magnetic fields on the shot noise of a quantum dot with Luttinger leads

• Published in: Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2021-05, Vol.129, p.114640, Article 114640
• Main Authors: Yang, Kai-Hua, Di, He-Yang, Wang, Huai-Yu, Wang, Xu
• Format: Article
• Language: English
• Subjects: Effect of magnetic field; Kondo effect; Luttinger liquid lead; Quantum dot; Shot noise
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2021.114640

We study the shot noise of a strongly correlated quantum dot system in the Kondo regime, concentrating on the joint effect of a magnetic field B and intralead Coulomb interaction. A shot noise formula is derived. The shot noise is suppressed by the magnetic field when the intralead interaction is weak, but improved by the field when the interaction is strong. The differential shot noise has a peak or valley at eV = ±gμBB for weak or moderately strong intralead interaction. As the interactions increase, these singular behaviours gradually disappear. In the strong interaction limit, the shot noise's curve has a power-law dependence on the voltage. The intralead Coulomb interaction also modulates the Fano line shape of shot noise. The Fano factor is enhanced by the magnetic field and dot-lead asymmetric coupling and is always sub-Poissonian noise. •Effects of magnetic field on suppression or enhancement of shot noise depends on the intralead interaction in Kondo region.•Some singular behaviors gradually disappear and the transition from peak to valley appears increasing intralead interaction.•For strong intralead interaction these novel structures disappears and the curve scales as a power-law behavior on voltage.•Fano factor is enhanced by the magnetic field and interaction but still belongs to sub-Poissonian noise.