Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-02-14
Phys. Rev. B 72, 245305 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 2 figures
Scientific paper
We find that in order to completely describe the spin transport, apart from spin current (or linear spin current), one has to introduce the angular spin current. The two spin currents respectively describe the translational and rotational motion of a spin. The definitions of these spin current densities are given and their physical properties are discussed. Both spin current densities appear naturally in the spin continuity equation. Moreover we predict that the angular spin current can also induce an electric field $\vec{E}$, and in particular $\vec{E}$ scales as $1/r^2$ at large distance $r$, whereas the $\vec{E}$ field generated from the linear spin current goes as $1/r^3$.
Sun Qing-feng
Xie Xin-Chen
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