Disentangling surface and bulk photoemission using circularly polarized light

Details Disentangling surface and bulk photoemission using circularly polarized light Disentangling surface and bulk photoemission using circularly polarized light

2007-02-21

arxiv.org/abs/cond-mat/0702499v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.76.024502

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 $\operatorname{div}\textbf{A}$ 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 YBa$_2$Cu$_3$O$_{7-\delta}$ crystal to distinguish between the overdoped surface related component and its bulk counterparts.

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