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Spin-resolved electron waiting times in a quantum-dot spin valve
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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Physical Review B, Volume 97, issue 16, pp. 1-9
Abstract
We study the electronic waiting-time distributions (WTDs) in a noninteracting quantum-dot spin valve by varying spin polarization and the noncollinear angle between the magnetizations of the leads using the scattering matrix approach. Since the quantum-dot spin valve involves two channels (spin up and down) in both the incoming and outgoing channels, we study three different kinds of WTDs, which are two-channel WTD, spin-resolved single-channel WTD, and cross-channel WTD. We analyze the behaviors of WTDs in short times, correlated with the current behaviors for different spin polarizations and noncollinear angles. Cross-channel WTD reflects the correlation between two spin channels and can be used to characterize the spin-transfer torque process. We study the influence of the earlier detection on the subsequent detection from the perspective of cross-channel WTD, and define the influence degree quantity as the cumulative absolute difference between cross-channel WTDs and first-passage time distributions to quantitatively characterize the spin-flip process. We observe that influence degree versus spin-transfer torque for different noncollinear angles as well as different polarizations collapse into a single curve showing universal behaviors. This demonstrates that cross-channel WTDs can be a pathway to characterize spin correlation in spintronics system.
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Tang, G, Xu, F, Mi, S & Wang, J 2018, 'Spin-resolved electron waiting times in a quantum-dot spin valve', Physical Review B, vol. 97, no. 16, 165407, pp. 1-9. https://doi.org/10.1103/PhysRevB.97.165407