Abstract
We study frequency-dependent current noise through a single-level quantum dot connected to ferromagnetic leads with noncollinear magnetization. We propose to use the frequency-dependent Fano factor as a tool to detect single-spin dynamics in the quantum dot. Spin precession due to an external magnetic and/or a many-body exchange field affects the Fano factor of the system in two ways. First, the tendency towards spin-selective bunching of the transmitted electrons is suppressed, which gives rise to a reduction of the low-frequency noise. Second, the noise spectrum displays a resonance at the Larmor frequency, whose line shape depends on the relative angle of the leads’ magnetizations.
9 More- Received 17 January 2006
DOI:https://doi.org/10.1103/PhysRevB.74.075328
©2006 American Physical Society