Tunable critical supercurrent and spin-asymmetric Josephson effect in superlattices

J.M. Kreula, M.O.J. Heikkinen, Francesco Massel, P. Törmä

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Combining the Josephson effect with magnetism, or spin dependence in general, creates novel physical phenomena. The spin-asymmetric Josephson effect is a predicted phenomenon where a spin-dependent potential applied across a Josephson junction induces a spin-polarized Josephson current. Here, we propose an approach to observe the spin-asymmetric Josephson effect with spin-dependent superlattices, realizable, e.g., in ultracold atomic gases. We show that observing this effect is feasible by studying numerically the quantum dynamics of the system in one dimension. Furthermore, we show that the enhancement, or tunability, of the critical supercurrent in ferromagnetic Josephson junctions [F. S. Bergeret, A. F. Volkov, and K. B. Efetov, Phys. Rev. Lett. 86, 3140 (2001)] can be explained by the spin-asymmetric Josephson effect.
Original languageEnglish
Article number064502
Pages (from-to)1-11
Number of pages11
JournalPhysical Review B
Issue number6
Publication statusPublished - 1 Feb 2014
MoE publication typeA1 Journal article-refereed


  • Josephson effect
  • Spin-asymmetric Josephson effect
  • ultracold gases

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