Interaction-induced current asymmetries in resonant transport through interacting quantum-dot spin valves revealed by iterative summation of path integrals

Mundinar, Simon; Hucht, Alfred; König, Jürgen; Weiss, S.

doi:10.1103/physrevb.102.045404

Cited by 3 publications

(1 citation statement)

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“…Significant efforts have been devoted to explore new spinbased functional devices with high performance and efficiency [14][15][16][17][18]. Among them, a nanoscale spin valve is widely considered as an essential candidate building block in spintronic devices [19][20][21][22][23][24][25][26][27][28][29]. It is of great importance to investigate its transport properties, where the spin-resolved correlations have a vital role to play.…”

Section: Introductionmentioning

confidence: 99%

Spin-resolved counting statistics as a sensitive probe of spin correlation in transport through a quantum dot spin valve

Hu,

Wang

et al. 2024

J. Phys.: Condens. Matter

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We investigate the noise in spin transport through a single quantum dot (QD) tunnel coupled to ferromagnetic electrodes with noncollinear magnetizations. Based on a spin-resolved quantum master equation, auto- and cross-correlations of spin-resolved currents are analyzed to reveal the underlying spin transport dynamics and characteristics for various polarizations. We find the currents of majority and minority spins could be strongly autocorrelated despite uncorrelated charge trans fer. The interplay between tunnel coupling and the Coulomb interaction gives rise to an exchange magnetic field, leading to the precession of the accumulated spin in the QD. It strongly suppresses the bunching of spin tunneling events and results in a unique double-peak structure in the noise ofthe net spin current. The spin autocorrelation is found to be susceptible to magnetization alignments, which may serve as a sensitive tool to measure the magnetization directions between the ferromagnetic electrodes.

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