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          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents

ID: 404164.0, Fritz-Haber-Institut / Physical Chemistry
Ultrafast electron dynamics in metals: Real-time analysis of a reflected light field using photoelectrons
Authors:Bovensiepen, Uwe; Declair, Stefan; Lisowski, Martin; Loukakos, Panagiotis A.; Hotzel, Arthur; Richter, Marten; Knorr, Andreas; Wolf, Martin
Date of Publication (YYYY-MM-DD):2009-01-20
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Issue / Number:04
Start Page:045415–1
End Page:045415–9
Copyright:© 2009 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We propose an approach to address ultrafast charge-carrier dynamics of metals by analyzing the momentum change in photoelectrons interacting with a transient optical grating at a metal surface. Photoelectrons are excited by an ultraviolet femtosecond laser pulse which precedes an infrared pulse setting up the transient grating. We measure the kinetic energy of the photoelectrons which are accelerated by the grating's ponderomotive potential and thus sample the respective electric field. The method is capable to access phase and amplitude differences between the incoming and the reflected light fields. The latter is determined by the response of the conduction-band electrons to the light field. We report on a demonstration of such an experimental scheme using a Gd(0001) surface and calculate the reflected field by a simplified transport equation. We derive a method to determine the average electron-scattering rate and study the time-dependent evolution of amplitude and phase of the reflected electric field including memory effects in the optically induced polarization dynamics. Finally, we discuss the required steps of this approach to probe ultrafast dynamics in metals experimentally.
Free Keywords:conduction bands; gadolinium; high-speed optical techniques; photoelectron spectra
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Bovensiepen U, Lisowski M, Loukakos PA, Hotzel A, Wolf M, Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany; Declair S, Richter M, Knorr A, Techn Univ Berlin, Inst Theor Phys, D-10623 Berlin, Germany
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