Proper definition of spin current qian niu university of texas at austin shi zhang xiao and niu prl 96 076604 2006 also see cond mat 0503505. You go that way with some quantum trickery laser light makes spin up electrons green flow one way and spin down electrons red flow the other inside a semiconductor the opposing flows produce a pure spin current without an electrical current you go that way with some quantum trickery laser . Conventional electronics devices use the electron charge to carry information in contrast the emerging field of spintronics relies on the electron spin advanced spintronics devices will require the generation and manipulation of a spin current but present methods for achieving such a current are cumbersome and inefficient requiring the use . The spin current orbit angular momentum current and total angular momentum current in a tensor form have been universally defined according to the quantum electrodynamics their conservation quantities and the continuity equations have been discussed in different cases non relativistic
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