Optical Generation of Hot Spin-Polarized Electrons from a Ferromagnetic Two-Dimensional Electron Gas

Physical Review Letters
Martin EllguthJ Kirschner

Abstract

Linearly polarized light with an energy of 3.1 eV has been used to excite highly spin-polarized electrons in an ultrathin film of face-centered-tetragonal cobalt to majority-spin quantum well states (QWS) derived from an sp band at the border of the Brillouin zone. The spin-selective excitation process has been studied by spin- and momentum-resolved two-photon photoemission. Analyzing the photoemission patterns in two-dimensional momentum planes, we find that the optically driven transition from the valence band to the QWS acts almost exclusively on majority-spin electrons. The mechanism providing the high spin polarization is discussed by the help of a density-functional theory calculation. Additionally, a sizable effect of spin-orbit coupling for the QWS is evidenced.

References

Jul 15, 1996·Physical Review. B, Condensed Matter·A FanelsaR Feder
Jun 15, 1992·Physical Review. B, Condensed Matter·J P Perdew, Y Wang
Mar 6, 1989·Physical Review Letters·D L Abraham, H Hopster
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Jun 3, 2008·The Review of Scientific Instruments·B KrömkerJ Kirschner
Aug 24, 2011·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Ian Appelbaum

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Citations

Jan 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Benjamin StadtmüllerMartin Aeschlimann
Jan 1, 2021·The Review of Scientific Instruments·G SchönhenseK Medjanik

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