Frequency-Dependent Current Noise through Quantum-Dot Spin Valves

Details Frequency-Dependent Current Noise through Quantum-Dot Spin Valves Frequency-Dependent Current Noise through Quantum-Dot Spin Valves

2006-01-17

arxiv.org/abs/cond-mat/0601366v1

Phys. Rev. B 74, 075328 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 15 figures

Scientific paper

10.1103/PhysRevB.74.075328

We study frequency-dependent current noise through a single-level quantum dot connected to ferromagnetic leads with non-collinear 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 lineshape depends on the relative angle of the leads' magnetizations.

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