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Phys. Rev. B 53 (1996) pp. 13817-13823
Integrity of quantum-well resonances in metallic overlayers
School of Physics, University of Bath, BA2 7AY, United Kingdom
Istituto Nazionale di Fisica della Materia-Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano, Italy
Abstract
Spin-polarized quantum well states in Ag/Fe(001) have been studied by
spin-resolved inverse photoemission and ab-initio electronic structure
calculations. We find excellent agreement between predicted and measured
sp-quantum well states, including majority-spin resonances previously
unobserved in this system.
These exhibit unusual behaviour, narrowing as they move
further into the continuum energy range. With increasing Ag coverage the
resonance widths are shown to reduce in line with level spacings,
indicating the quantum well levels retain their integrity in thick films.