Effect of wave-function localization on the time delay in photoemission from surfaces

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dc.contributor.author Zhang, Chang-Hua
dc.contributor.author Thumm, Uwe P. E.
dc.date.accessioned 2013-04-12T15:06:52Z
dc.date.available 2013-04-12T15:06:52Z
dc.date.issued 2013-04-12
dc.identifier.uri http://hdl.handle.net/2097/15501
dc.description.abstract We investigate streaking time delays in the photoemission from a solid model surface as a function of the degree of localization of the initial-state wave functions. We consider a one-dimensional slab with lattice constant a[subscript latt] of attractive Gaussian-shaped core potentials of width σ. The parameter σ/a[subscript latt] thus controls the overlap between adjacent core potentials and localization of the electronic eigenfunctions on the lattice points. Small values of σ/a[subscript latt]≪1 yield lattice eigenfunctions that consist of localized atomic wave functions modulated by a “Bloch-envelope” function, while the eigenfunctions become delocalized for larger values of σ/a[subscript latt]≳0.4. By numerically solving the time-dependent Schrödinger equation, we calculate photoemission spectra from which we deduce a characteristic bimodal shape of the band-averaged photoemission time delay: as the slab eigenfunctions become increasingly delocalized, the time delay quickly decreases near σ/a[subscript latt]=0.3 from relatively large values below σ/a[subscript latt]∼0.2 to much smaller delays above σ/a[subscript latt]∼0.4. This change in wave-function localization facilitates the interpretation of a recently measured apparent relative time delay between the photoemission from core and conduction-band levels of a tungsten surface. en_US
dc.language.iso en_US en_US
dc.relation.uri http://pra.aps.org/abstract/PRA/v84/i6/e065403 en_US
dc.rights ©2011 American Physical Society en_US
dc.subject Wave-function localization en_US
dc.subject Photoemission en_US
dc.title Effect of wave-function localization on the time delay in photoemission from surfaces en_US
dc.type Article (publisher version) en_US
dc.date.published 2011 en_US
dc.citation.doi doi:10.1103/PhysRevA.84.065403 en_US
dc.citation.epage 065403-4 en_US
dc.citation.issue 6 en_US
dc.citation.jtitle Physical Review A en_US
dc.citation.spage 065403-1 en_US
dc.citation.volume 84 en_US
dc.contributor.authoreid thumm en_US

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