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Observation of Pulsed Laser – Induced Melting of Solid Surfaces by Optical Spin Orientation

Published online by Cambridge University Press:  25 February 2011

A. Vaterlaus ,
M. Lutz ,
D. Guarisco ,
M. Aeschlimann ,
M. Stampanoni  and
F. Meier
A. Vaterlaus
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
M. Lutz
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
D. Guarisco
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
M. Aeschlimann
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
M. Stampanoni
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
F. Meier
Affiliation:
Laboratorium für Festkörperphysik, ETH Hönggerberg, 80 93 Zürich, Switzerland
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Abstract

The optically induced spin polarization P of the photoelectrons emitted from tin and germanium during ps and ns laser pulses is measured as a function of the pulse energy. P is defined by the lattice symmetry of the sample. It vanishes for amorphous or molten surfaces. The melting of the metal and the semiconductor is found to occur on a time scale which is short compared to the duration of a 70 ps laser pulse. The emission of positive ions starts at the laser intensity for which the drop of the polarization is observed. If Ge is heated with ns laser pulses a temperature dependent shift of the work function causes a decrease of the spin polarization for laser energies far below the energy necessary for melting. With ps laser pulses the polarization only vanishes for pulse energies exceeding Eion- The difference between the ps and ns measurements on Ge points to an unexpected dynamical behavior of the work function shift in semiconductors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 377
Copyright
Copyright © Materials Research Society 1990

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References

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