Disentangling surface and bulk photoemission using circularly polarized light

We show that in 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 div A in the photoemission matrix element. The term happens to be significant approximately within the first unit cell and leads to circular dichroism for the states localized therein. As an example we use ARPES spectra of an YBa2Cu3O7� crystal to distinguish between the overdoped surface related component and its bulk counterparts.