From Coulomb blockade to the Kondo regime in a Rashba dot

Details From Coulomb blockade to the Kondo regime in a Rashba dot From Coulomb blockade to the Kondo regime in a Rashba dot

2006-10-18

arxiv.org/abs/cond-mat/0610515v2

Phys. Rev. B 76, 035307 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures; presentation improved, discussions extended. Published version

Scientific paper

10.1103/PhysRevB.76.035307

We investigate the electronic transport in a quantum wire with localized Rashba interaction. The Rashba field forms quasi-bound states which couple to the continuum states with an opposite spin direction. The presence of this Rashba dot causes Fano-like antiresonances and dips in the wire's linear conductance. The Fano lineshape arises from the interference between the direct transmission channel along the wire and the hopping through the Rashba dot. Due to the confinement, we predict the observation of large charging energies in the local Rashba region which lead to Coulomb-blockade effects in the transport properties of the wire. Importantly, the Kondo regime can be achieved with a proper tuning of the Rashba interaction, giving rise to an oscillating linear conductance for a fixed occupation of the Rashba dot.

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