# Spin accumulation due to Rashba-Edelstein effect

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semc
TL;DR Summary
How to see spin accumulation due to Rashba-Edelstein effect from band diagram
I am trying to understand how do we see the spin accumulation due to Rashba-Edelstein effect. I mean everywhere I look people just say a shift in the bands due to e-field which results in spin accumulation in the transverse direction (y in this case) as shown

Can somebody explain how to see that? If we talk about the blue circle for example, I would say more up spin with +ve k than -ve k so there will be more spin up accumulation in the positive x direction. Is this wrong? Why would there be any change in y?

I would also like to check if the spin of the electrons should be rotated as the band is shifted

If spin-momentum locking is still present (which it should be), the spins should be rotated since the k values are changed?

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