Quantum enhancement of spin drag in a Bose gas

In spintronics the active control and manipulation of spin currents is studied in solid-state systems. Opposed to charge currents, spin currents are strongly damped due to collisions between different spin carriers in addition to relaxation due to impurities and lattice vibrations. The phenomenon of...

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Bibliographic Details
Published in:New journal of physics 2015-11, Vol.17 (11), p.113026
Main Authors: Koller, S B, Groot, A, Bons, P C, Duine, R A, Stoof, H T C, Straten, P van der
Format: Article
Language:English
Subjects:
67.10.Jn
67.85.-d
75.76.+j
Active control
Cold spinning
Current carriers
Damping
Drag
Electric current
Fluid dynamics
hydrodynamics
Lattice vibration
Phase transformations
Phase transitions
Physics
Space density
spin transport
Spintronics
Stimulation
ultracold gases
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Summary:In spintronics the active control and manipulation of spin currents is studied in solid-state systems. Opposed to charge currents, spin currents are strongly damped due to collisions between different spin carriers in addition to relaxation due to impurities and lattice vibrations. The phenomenon of relaxation of spin currents is called spin drag. Here we study spin drag in ultra-cold bosonic atoms deep in the hydrodynamic regime and show that spin drag is the dominant damping mechanism for spin currents in this system. By increasing the phase space density we find that spin drag is enhanced in the quantum regime by more than a factor of two due to Bose stimulation, which is in agreement with recent theoretical predictions and, surprisingly, already occurs considerably above the phase transition.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/11/113026