Superconducting proximity effect in interacting double-dot systems
arXiv:1006.1790 · doi:10.1103/PhysRevB.82.184507
Abstract
We study subgap transport from a superconductor through a double quantum dot with large on-site Coulomb repulsion to two normal leads. Non-local superconducting correlations in the double dot are induced by the proximity to the superconducting lead, detectable in non-local Andreev transport that splits Cooper pairs in locally separated, spin-entangled electrons. We find that the -- characteristics are strongly asymmetric: for a large bias voltage of certain polarity, transport is blocked by populating the double dot with states whose spin symmetry is incompatible with the superconductor. Furthermore, by tuning gate voltages one has access to splitting of the Andreev excitation energies, which is visible in the differential conductance.
5 pages, 4 figures
References in corpus (14)
- Supercurrent reversal in quantum dots
- Quantum supercurrent transistors in carbon nanotubes
- Josephson current through a single Anderson impurity coupled to BCS leads
- Even-odd effect in Andreev Transport through a Carbon Nanotube Quantum Dot
- Kondo-Enhanced Andreev Tunneling in InAs Nanowire Quantum Dots
- Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
- Real-time diagrammatic approach to transport through interacting quantum dots with normal and superconducting leads
- Sign of the crossed conductances at a FSF double interface
- Circuit theory of crossed Andreev reflection
- Kondo effect in asymmetric Josephson couplings through a quantum dot
- Nonlocal Andreev reflection at high transmissions
- Non-local Andreev transport through an interacting quantum dot
- Crossed Andreev reflection in diffusive contacts
- Non-local Andreev reflection in superconducting quantum dots