Direct measurements of the transport of nonequilibrium electrons in gold films with different crystal structures

The transport of femtosecond-laser-excited nonequilibrium electrons across polycrystalline and single-crystalline gold films was investigated through time-of-flight measurements. The thicknesses of the films range from 25 to 400 nm. Ballistic electrons and electrons interacting with other electrons...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1993-11, Vol.48 (20), p.15488-15491
Main Authors: JUHASZ, T, ELSAYED-ALI, H. E, SMITH, G. O, SUAREZ, C, BRON, W. E
Format: Article
Language:English
Subjects:
360104 - Metals & Alloys- Physical Properties
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
Electrical properties of specific thin films
ELECTROMAGNETIC RADIATION
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
ELEMENTS
ENERGY LEVELS
Exact sciences and technology
EXCITED STATES
GOLD
GRAIN BOUNDARIES
LASER RADIATION
Low-field transport and mobility
piezoresistance
MATERIALS SCIENCE
Metal and metallic alloys
METALS
Metals and metallic alloys
Metals. Metallurgy
MICROSTRUCTURE
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
Physics
POLYCRYSTALS
RADIATION EFFECTS
RADIATIONS
THIN FILMS
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENTS
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Summary:The transport of femtosecond-laser-excited nonequilibrium electrons across polycrystalline and single-crystalline gold films was investigated through time-of-flight measurements. The thicknesses of the films range from 25 to 400 nm. Ballistic electrons and electrons interacting with other electrons and/or with the lattice were observed. The ballistic component dominates the transport in thinner films, whereas the interactive transport mechanism is dominant at the upper end of the thickness range. A slower effective velocity of the interactive component is observed in the polycrystalline samples and is assumed to arise from the presence of grain boundaries. The reflection coefficient of excited electrons at the grain boundaries is extracted from the experiment and is estimated to be rapprox =0.12. The experiment also suggests that thermal equilibrium among the excited electrons is not fully established in the first approx500 fs after excitation.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.48.15488