Why does charge current cause spin accumulation in the Edelstein effect?

[semc]

Hi, I have been trying to understand the Edelstein effect but it seems like everywhere I look, I get the same explanation which I don't understand. So everyone says that if you have a charge current, the Fermi contour will be displaced and spin density will accumulate along the orthogonal direction resulting in a spin current. I don't see the spin accumulation along the y-axis. How do we get that conclusion from this picture?

 

[semc]

Ok I misunderstood the meaning...Got it now