Nonadiabatic dynamics of electron scattering from adsorbates in surface bands
Gumhalter B, Siber A, Buljan H, Fauster T (2008)
Publication Status: Published
Publication Type: Journal article
Publication year: 2008
Journal
Publisher: American Physical Society
Book Volume: 78
Article Number: 155410
DOI: 10.1103/PhysRevB.78.155410
Abstract
We present a comparative study of nonadiabatic dynamics of electron scattering in quasi-two-dimensional surface band which is induced by the long-range component of the interactions with a random array of adsorbates. Using three complementary model descriptions of intraband spatiotemporal propagation of quasiparticles that go beyond the single-adsorbate scattering approach we are able to identify distinct subsequent regimes of evolution of an electron following its promotion into an unoccupied band state: (i) early quadratic or ballistic decay of the initial-state survival probability within the Heisenberg uncertainty window, (ii) preasymptotic exponential decay governed by the self-consistent Fermi golden rule scattering rate, and (iii) asymptotic decay described by a combined inverse power-law and logarithmic behavior. The developed models are applied to discuss the dynamics of intraband adsorbate-induced scattering of hot electrons excited into the n=1 image-potential band on Cu(100) surface during the first stage of a two-photon photoemission process. Estimates of crossovers between the distinct evolution regimes enable assessments of the lifespan of a standard quasiparticle behavior and thereby of the range of applicability of the widely used Fermi golden rule and optical Bloch equations approach for description of adsorbate-induced quasiparticle decay and dephasing in ultrafast experiments.
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APA:
Gumhalter, B., Siber, A., Buljan, H., & Fauster, T. (2008). Nonadiabatic dynamics of electron scattering from adsorbates in surface bands. Physical Review B, 78. https://doi.org/10.1103/PhysRevB.78.155410
MLA:
Gumhalter, Branko, et al. "Nonadiabatic dynamics of electron scattering from adsorbates in surface bands." Physical Review B 78 (2008).
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