A Explanation of the Diagram of Rashba Effect

Hello,

I find something about the Rashba Spin Orbit coupling but im not sure how to understand it. Hope you can help me. Consider the following picture of the Rashba effect i found:
Rashba.png


Well i dont really know whats about the arrows here. They should showing the spin direction i guess but i dont see there meaning.
Can somebody help how to interprete this diagram??
 

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