Magnetoresistance and transistor-like behavior of double quantum dots connected to ferromagnetic and superconductor leads
arXiv:1003.3688 · doi:10.1063/1.4723000
Abstract
The electric current and the magnetoresistance effect are studied in a double quantum-dot system, where one of the dots QDa is coupled to two ferromagnetic electrodes (F1,F2), while the second QDb is connected to a superconductor S. For energy scales within the superconductor gap, electric conduction is allowed by Andreev reflection processes. Due to the presence of two ferromagnetic leads, non-local crossed Andreev reflections are possible. We found that the magnetoresistance sign can be changed by tuning the external potential applied to the ferromagnets. In addition, it is possible to control the current of the first ferromagnet (F1) through the potential applied to the second one (F2). We have also included intradot interaction and gate voltages at each quantum dot and analyzed their influence through a mean field approximation. The interaction reduces the current amplitudes with respect to the non-interacting case, but the switching effect still remains as a manifestation of quantum coherence, in scales of the order of the superconductor coherence length.
Revised version
References in corpus (21)
- A spin triplet supercurrent through the half-metallic ferromagnet CrO2
- Kondo effect in quantum dots coupled to ferromagnetic leads
- Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
- NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
- Current-current correlations in hybrid superconducting and normal metal multiterminal structures
- Circuit theory of crossed Andreev reflection
- Josephson effect and spin-triplet pairing correlations in SF1F2S junctions
- Long-Range Superharmonic Josephson Current
- Crossed Andreev reflection in diffusive contacts
- Long-range spin-triplet proximity effect in Josephson junctions with multilayered ferromagnets
- Andreev Transport through Side-Coupled Double Quantum Dots
- Interplay between Josephson effect and magnetic interactions in double quantum dots
- Crossed Andreev reflection at ferromagnetic domain walls
- A gate-defined silicon quantum dot molecule
- Multiple Andreev reflections in a quantum dot coupled to superconductors: Effects of spin-orbit coupling
- Long ranged singlet proximity effect in ferromagnetic nanowires
- Nonlocal pure spin current injection via quantum pumping and crossed Andreev reflection
- Singlet-triplet filtering and entanglement in a quantum dot structure
- Local and nonlocal entanglement for quasiparticle pairs induced by Andreev reflection
- Spin detection at elevated temperatures using a driven double quantum dot
- Crossed conductance in FSF double junctions: role of out-of-equilibrium populations
Cited by in corpus (4)
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- Transport properties of proximitized double quantum dots
- Properties of multiterminal superconducting nanostructure with double quantum dot