Abstract
We study shot noise for spin-polarized currents and entangled electron pairs in a four-probe (beam-splitter) geometry with a local Rashba spin-orbit () interaction in the incoming leads. Within the scattering formalism we find that shot noise exhibits Rashba-induced oscillations with continuous bunching and antibunching. We show that entangled states and triplet states can be identified via their Rashba phase in noise measurements. For two-channel leads, we find an additional spin rotation due to induced interband coupling which enhances spin control. We show that the interaction determines the Fano factor, which provides a direct way to measure the Rashba coupling constant via noise.
- Received 1 May 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.176401
©2002 American Physical Society