1997
DOI: 10.1103/physrevlett.79.4645
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Dynamics and Spatial Distribution of Electrons in Quantum Wells at Interfaces Determined by Femtosecond Photoemission Spectroscopy

Abstract: The dynamics of excited electrons in insulator quantum well states on a metal substrate were determined by femtosecond two-photon photoemission for the first time. Lifetimes are reported for the first three excited states for 1-6 atomic layers of Xe on Ag(111). As the image states evolve into quantum well states with increasing coverage, the lifetimes undergo an oscillation as the layer boundary crosses each node of the wave function. The lifetime data are modeled by extending the two-band nearly free-electron… Show more

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Cited by 70 publications
(65 citation statements)
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“…50,51,[55][56][57][58][59][60] However, in the case of dielectric spacer layers, the lifetimes of excited states show the dependence on the overlayer thickness distinct from the present results. Thus, for Xe/Ag(111) the decay rates of the n = 2 and n = 3 ISs hybridized with QWSs show an oscillating structure with increasing Xe coverage.…”
Section: Calculated Decay Ratescontrasting
confidence: 53%
See 1 more Smart Citation
“…50,51,[55][56][57][58][59][60] However, in the case of dielectric spacer layers, the lifetimes of excited states show the dependence on the overlayer thickness distinct from the present results. Thus, for Xe/Ag(111) the decay rates of the n = 2 and n = 3 ISs hybridized with QWSs show an oscillating structure with increasing Xe coverage.…”
Section: Calculated Decay Ratescontrasting
confidence: 53%
“…This has been experimentally confirmed in TR-2PPE studies of the ISs at surfaces of rare-gas adlayers on metal surfaces. 50,51,[55][56][57][58][59][60] In these systems, strong quantum size effects on the lifetimes of the ISs have been found and successfully interpreted as due to the hybridization between the ISs and the QWSs localized in the conduction band of the dielectric adlayer. The purpose of the present contribution is to show how the QWSs in metallic Pb overlayers on Cu(111) surfaces are modified close to the vacuum level by the hybridization with the ISs.…”
Section: Introductionmentioning
confidence: 99%
“…If the energy levels of the image-potential states become degenerate with the conduction band of the adlayer, as it is the case for the n ¼ 2 state and the rare gases Xe and Kr, the wave function of the states penetrate the layer. In this case, a quantum-well-like behavior with an oscillatory dependence of energy and lifetime as a function of layer thickness is found [272,273].…”
Section: Decoupling By Spacer Layersmentioning
confidence: 93%
“…This is attributed to the larger density of states around E F [195]. The influence of rare-gas layers on the properties of image-potential states have been investigated for Xe/Ag(1 1 1) [259,272], Xe/Cu (1 1 1) [262,263,318], Ar, Kr and Xe on Cu(1 0 0) [268,269,273] and Xe/Ru(0 0 0 1) [266,267]. Experimental results for the lifetime of the states are collected in Table 10 for various systems together with predictions from different models.…”
Section: Magnetic Surface Statesmentioning
confidence: 99%
“…In fact, the TPPE studies of multilayer Xe/Ag(111) 24,25 indicate quantum confinement effects in the Xe slab. As the Xe layer thickness increases, the n ) 2, 3 image states of the bare metal evolve into quantum well states of the layer and become more bound just like a particle in a box.…”
Section: Electron Tunneling At Metal-alkane Interfacesmentioning
confidence: 99%