SURFACE ANISOTROPY OF SECOND HARMONIC GENERATION AT Al(111)

Petukhov, A.V.; Liebsch, A.

SURFACE ANISOTROPY OF SECOND HARMONIC GENERATION AT Al(111)

A.V. Petukhov and A. Liebsch
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A.V. Petukhov: Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
A. Liebsch: Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 521-523

Abstract: We present results of the first calculation of the surface anisotropic contribution to second harmonic generation for a realistic metal surface. Although the anisotropic second-order response has its origin at the surface, the main contribution to the surface anisotropic parameter ξ has a remarkably large penetration depth. Moreover, the long-range oscillations of the anisotropic nonlinear surface current deep inside aluminum are found. The surface anisotropic secondorder polarizability ξ is in a good qualitative agreement with recent experimental data on clean Al(111) atħω=1.17eV. A resonant enhancement of the SHG anisotropy is predicted for ω and 2ω close to 1.5 eV—the energy gap in bulk aluminum along the [100] directions. A significant decrease of the surface anisotropic response in comparison with the isotropic one is found forω≥1.5 eV.

Date: 1994
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DOI: 10.1142/S0218625X94000576

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