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The layered structure of the iron based superconductors gives rise to a moreor less pronounced two-dimensionality of their electronic structure, mostpronounced in LaOFeAs. A consequence are distinct surface states to be expectedto influence any surface sensitive experimental probe. In this work a detaileddensity functional analysis of the cleavage behavior and the surface electronicstructure of LaOFeAs is presented. The surface states are obtained to formtwo-dimensional bands with their own Fermi surfaces markedly different from thebulk electronic structure.

Calculated Cleavage Behavior and Surface States of LaOFeAs