Rashba spin-orbit interaction and shot noise for spin-polarized and entangled electrons

Details Rashba spin-orbit interaction and shot noise for spin-polarized and entangled electrons Rashba spin-orbit interaction and shot noise for spin-polarized and entangled electrons

2002-04-30

arxiv.org/abs/cond-mat/0204639v2

Phys. Rev. Lett. 89, 176401 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 eps figures. Minor changes to text (typos/misprints). Slight change to Fig. 2

Scientific paper

10.1103/PhysRevLett.89.176401

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 (s-o) 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 s-o induced interband coupling which provides enhanced spin control. We show that the s-o interaction determines the Fano factor which provides a direct way to measure the Rashba coupling constant via noise.

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