Nonadiabatic dynamics of electron scattering from adsorbates in surface bands

Gumhalter, Branko and Šiber, Antonio and Buljan, Hrvoje and Fauster, Thomas (2008) Nonadiabatic dynamics of electron scattering from adsorbates in surface bands. Physical Review B, 78 (15). pp. 155410-15. ISSN 1098-0121

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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.

Item Type: Article
Keywords: quantum dynamics, scattering, adsorbates, impurities, surfaces, non-adiabatic
Date: October 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2008) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0000000-1015, 035-0352828-2837, 035-0352828-2839
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 May 2014 18:10
Last Modified: 27 May 2014 18:10

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