Measuring Spin Accumulations with Current Noise
arXiv:1104.2353 · doi:10.1103/PhysRevB.84.073302
Abstract
We investigate the time-dependent fluctuations of the electric current injected from a reservoir with a non-equilibrium spin accumulation into a mesoscopic conductor. We show how the current noise power directly reflects the magnitude of the spin accumulation in two easily noticeable ways. First, as the temperature is lowered, the small-bias noise saturates at a value determined by the spin accumulation. Second, in the presence of spin-orbit interactions in the conductor, the current noise exhibits a sample-dependent mesoscopic asymmetry under reversal of the electric current direction. These features provide for a purely electric protocol for measuring spin accumulations.
4 pages, 2 figures
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- Measuring electron energy distribution by current fluctuations
- Dynamics of Pure Spin Current in High-frequency Quantum Regime
- Non-Markovian full counting statistics in quantum dot molecules