Probing entanglement via Rashba-induced shot noise oscillations

Details Probing entanglement via Rashba-induced shot noise oscillations Probing entanglement via Rashba-induced shot noise oscillations

2002-07-16

arxiv.org/abs/cond-mat/0207392v1

Journal of Superconductivity 16, 711 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures; to appear in the special issue of the Journal of Superconductivity in honor of E. I. Rashba

Scientific paper

We have recently calculated shot noise for entangled and spin-polarized electrons in novel beam-splitter geometries with a local Rashba s-o interaction in the incoming leads. This interaction allows for a gate-controlled rotation of the incoming electron spins. Here we present an alternate simpler route to the shot noise calculation in the above work and focus on only electron pairs. Shot noise for these shows continuous bunching and antibunching behaviors. In addition, entangled and unentangled triplets yield distinctive shot noise oscillations. Besides allowing for a direct way to identify triplet and singlet states, these oscillations can be used to extract s-o coupling constants through noise measurements. Incoming leads with spin-orbit interband mixing give rise an additional modulation of the current noise. This extra rotation allows the design of a spin transistor with enhanced spin control.

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