Spin superconductor in ferromagnetic graphene
Qing-feng Sun, Zhao-tan Jiang, Yue Yu, X. C. Xie
DOI 10.1103/PhysRevB.84.214501 · Physical Review B
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Abstract
We show a spin superconductor in ferromagnetic graphene as the counterpart to the charge superconductor in which a spin-polarized electron-hole pair plays the role of the spin 2(ℏ/2) “Cooper pair” with a neutral charge. We present a BCS-type theory for the spin superconductor. With the “London-type equations” of the super-spin-current density, we show the existence of an electric “Meissner effect” against a spatial varying electric field. We further study a spin superconductor/normal conductor/spin superconductor junction and predict a spin-current Josephson effect.
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