[Pw_forum] zero energy reference

[Paolo Giannozzi]

Ramiro Cardona wrote:

> ¿The energy away from the niquel surface should be zero?

"the energy" ? maybe "the potential"? no.

> ¿What's the zero energy reference?

the "zero energy reference" is arbitrary. See for instance
http://www.democritos.it/pipermail/pw_forum/2004-December/001732.html
This may also be of interest for you:
http://www.quantum-espresso.org/wiki/index.php/Work_function

Paolo
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Paolo Giannozzi, Democritos and University of Udine, Italy