Theory for the Nonlinear Optical Response of Transition-Metals: Polarization Dependence as a Fingerprint of the Electronic Structure at Surfaces and Interfaces

Details Theory for the Nonlinear Optical Response of Transition-Metals: Polarization Dependence as a Fingerprint of the Electronic Structure at Surfaces and Interfaces Theory for the Nonlinear Optical Response of Transition-Metals: Polarization Dependence as a Fingerprint of the Electronic Structure at Surfaces and Interfaces

1994-08-03

arxiv.org/abs/cond-mat/9408012v1

Physics

Condensed Matter

20 pages+ 4 postscript-formatted figures,Revtex, submitted to Phys. Rev. B 08/02/1994

Scientific paper

We show that the nonlinear optical response reflects sensitively the electronic structure of transition-metal surfaces and interfaces. $d$ and $s$ electrons may contribute rather differently to the second harmonic generation (SHG) signal. This results from the different sensitivity of $d$ and $s$ electrons to surface and symmetry changes. Consequently, SHG for noble metals shows a by far larger dependence on the polarization of the incoming light than for transition metals like Fe, Co, Ni, in particular at lower frequencies. The theoretical results are compared with recent measurements. We conclude that the SHG yield is in addition to the nonlinear magneto-optical Kerr-effect a sensitive fingerprint of the electronic structure at surfaces and interfaces.

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