Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 22, Pages 5108-5111Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.5108
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Angle-resolved photoemission spectra from Na adlayers on Al(111) reveal features which behave like quantum well resonances although the substrate provides no confining barrier. These features are observed in a narrow photon energy range where overlayer collective excitations cause resonant enhancement of the photoemission intensity. The quantum well behavior is shown to be due to surface resonances of the Na/Al system. The resonances are observable using photoemission because of spatial confinement and dynamical enhancement of the local electric field within the: Na films.
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