Quantum enhancement of spin drag in a Bose gas

S. B. Koller*, A. Groot, P. C. Bons, R. A. Duine, H. T. C. Stoof, P. van der Straten

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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.

Original languageEnglish
Article number113026
Number of pages7
JournalNew Journal of Physics
Volume17
DOIs
Publication statusPublished - 9 Nov 2015

Keywords

  • ultracold gases
  • hydrodynamics
  • spin transport
  • FERMI GAS
  • SPINTRONICS
  • FUTURE

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