Spin-resolved electron waiting times in a quantum-dot spin valve

Gaomin Tang, Fuming Xu, Shuo Mi, Jian Wang

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
124 Downloads (Pure)

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.

Original languageEnglish
Article number165407
Pages (from-to)1-9
JournalPhysical Review B
Volume97
Issue number16
DOIs
Publication statusPublished - 5 Apr 2018
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Spin-resolved electron waiting times in a quantum-dot spin valve'. Together they form a unique fingerprint.

Cite this