Splitting electronic spins with a Kondo double dot device

Abstract

We present a simple device made of two small capacitively coupled quantum dots in parallel. This set-up can be used as an efficient "Stern-Gerlach" spin filter, able to simultaneously produce, from a normal metallic lead, two oppositely spin-polarized currents when submitted to a local magnetic field. Our proposal is based on the realization of a Kondo effect where spin and orbital degrees of freedom are entangled, allowing a spatial separation between the two spin polarized currents. In the low temperature Kondo regime, the efficiency is very high and the device conductance reaches the unitary limit, $\frac{e^2}{h}$ per spin branch.

3 pages, 2 figures

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Cited by in corpus (10)

• Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot
• Full electrostatic control over polarized currents through spin-orbital Kondo effect
• Enhanced spin Hall effect by tuning antidot potential: Proposal for a spin filter
• Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
• Polarized currents and spatial separation of Kondo state: NRG study of spin-orbital effect in a double QD
• The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem
• Electronic spin precession and interferometry from spin-orbital entanglement in a double quantum dot
• Orbital Kondo effect in a parallel double quantum dot
• SU(4) Kondo entanglement in double quantum dot devices
• Spin-orbital Kondo decoherence by environmental effects in capacitively coupled quantum dot devices