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Nonlocal Spin Transport Mediated by a Vortex Liquid in Superconductors
Se Kwon Kim1,2, Roberto Myers3,4, Yaroslav Tserkovnyak1
1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Physical Review Letters
|November 17, 2018
Summary
We propose using superconducting vortices as information carriers, converting spin to vorticity at interfaces. This enables long-range spin transport via vortex liquids, outperforming conventional methods.
Area of Science:
- Condensed Matter Physics
- Topological Materials Science
Background:
- Superconducting vortices are typically viewed as sources of energy dissipation.
- Topological excitations like vortices possess stable properties.
Purpose of the Study:
- To explore the use of mobile vortices as topologically stable information carriers.
- To investigate the interconversion between spin and vorticity at magnetic insulator-superconductor interfaces.
Main Methods:
- Developed a phenomenological theory for spin-vorticity interconversion.
- Utilized the interfacial spin Hall effect.
- Modeled spin transport through a vortex liquid in superconductors.
Main Results:
- Demonstrated spin-vorticity conversion at the interface.
- Showcased vortex liquids as spin-transport channels between magnetic insulators.
- Observed algebraic decay of vortex-mediated spin signals, unlike exponential quasiparticle decay.
Conclusions:
- Vortices can act as robust carriers of spin information.
- Vortex hydrodynamics offers a universal framework for long-range transport in ordered materials.
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