Spin Current due to Spinlike Andreev Reflection
Baigeng Wang, Ju Peng, D. Y. Xing, Jian Wang
DOI 10.1103/PhysRevLett.95.086608 · Physical Review Letters
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Abstract
We propose theoretically a spinlike Andreev reflection that may occur at the interface of a semimetal and a doped excitonic insulator. In contrast to the usual Andreev reflection, this process does not produce the charge current, but gives rise to a pure spin current. Further investigation reveals the existence of a spinlike Josephson phenomenon between two excitonic insulators with ferromagnetism, which results in a dissipationless spin current. We stress that the present spin current satisfies the conservation condition and is quite different from the spin Hall current induced from spin-orbital interactions.
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