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Charge and spin transport in mesoscopic superconductors
M J Wolf1, F Hübler1, S Kolenda1
1Karlsruher Institut für Technologie (KIT), Institut für Nanotechnologie, P.O. Box 3640, D-72021 Karlsruhe, Germany.
Beilstein Journal of Nanotechnology
|March 8, 2014
Summary
Researchers observed long-range, pure spin currents in superconductor nanostructures at low temperatures. This discovery enables new methods for manipulating quasiparticle spin in these materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
Background:
- Investigated non-equilibrium charge transport in superconductors near critical temperatures.
- Limited research on low-temperature quasiparticle spin dynamics.
Purpose of the Study:
- Explore nonlocal transport in superconductor hybrid structures at very low temperatures.
- Discriminate charge and spin transport using different detectors.
Main Methods:
- Fabrication of superconductor hybrid structures.
- Measurement of nonlocal conductance with ferromagnetic and normal-metal detectors.
- Comparison with theoretical models for charge and spin transport.
Main Results:
- Observed spin injection and long-range transport of pure, chargeless spin currents.
- Demonstrated transport in the regime of large Zeeman splitting.
- Successfully discriminated charge and spin degrees of freedom.
Conclusions:
- Reported long-range chargeless spin transport in superconductor nanostructures.
- Opened new avenues for manipulating quasiparticle spin.
- Provided insights into low-temperature spin dynamics in superconductors.
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