electric filed direction and electron accumlation(depletion)

[megan]

I am confused about the plane-averaged electrostatic potential and electronic charge density difference, when I add a negetive direction electric field, the electron accumlation occurs near the upper slab, while electron depletion occurs near the bottom slab. the phneomenon seems contradicted with what electric filed direction we infer from foundmental physicals and some result in published articles. However, I repeatedly confirm my result, and attach the related result in the attachment.
The model difference is that I put the four-layer slab at the bottom and 15 angstrom vacuum above, while some models in the published articles was that slab in the middle of the model, vaccum at the both end.
Looking forward to your reply and suggestions. Thank you very much.

[support_vasp]

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