We show that in the angle resolved photoemission spectroscopy (ARPES) near-surface induced fields can be useful for disentangling the surface and bulk related emission. The jump of the dielectric function at the interface results in a nonzero term divA in the photoemission matrix element. The term happens to be significant approximately within the first unit cell and leads to the circular dichroism for the states localized therein. As an example we use ARPES spectra of an YBa2Cu3O7−δ crystal to distinguish between the overdoped surface related component and its bulk counterparts.
@article{arxiv.cond-mat/0702499,
title = {Disentangling surface and bulk photoemission using circularly polarized light},
author = {V. B. Zabolotnyy and S. V. Borisenko and A. A. Kordyuk and D. S. Inosov and A. Koitzsch and J. Geck and J. Fink and 1 M. Knupfer and 1 B. Buechner and S. -L. Drechsler and V. Hinkov and 3 B. Keimer and L. Patthey},
journal= {arXiv preprint arXiv:cond-mat/0702499},
year = {2009}
}