Friday, July 5, 2013

1307.1198 (Andreas Inhofer et al.)

On-demand source of polarized electrons    [PDF]

Andreas Inhofer, Dario Bercioux
We propose a device that allows for the emission of pairs of spin-polarized electrons into the edge-states of a two dimensional topological insulator. Charge and spin emission is achieved using a periodically driven quantum dot weakly coupled to the edge states. We present calculations of the emitted time-dependent charge and spin currents of such a dynamical scatterer using the Floquet scattering matrix approach. Experimental signatures of spin-polarized two-particle emission can be found in the current-correlation measurements. Additionally, we propose an entanglement scheme for the emitted particles.
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