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SUMMARY:The stochastic wave function method for diffusion of alkali atoms 
 on metallic surface - Elena Torres\, Institute of Fundamental Physics\, Ma
 drid\, Spain
DTSTART:20231102T150000Z
DTEND:20231102T160000Z
UID:TALK207445@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:The stochastic wave function method is proposed to study the d
 iffusion regimes of alkali atoms on metallic surfaces. The Lindblad approa
 ch\, based on the microscopic Hamiltonian information in the Caldeira-Legg
 ett model\, is presented\, and numerical calculations of the dynamics are 
 carried out to characterize surface diffusion for two different systems: N
 a-Cu(111) and Li-Cu(111). The intermediate scattering functions obtained f
 rom numerical simulations for an isolated adsorbate are compared\, in the 
 Brownian limit\, with results deduced from helium spin-echo (HeSE) experim
 ents after reducing them to a single adsorbate dynamics. To illustrate the
  method\, we present the dependence on momentum transfer and the temperatu
 re dependency. Results show that the 1-D quantum model (reduced dimensiona
 lity) can describe the experiment at a quantitative level.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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