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  4. Comparing the oscillation phase in optical pump-probe spectra to ultrafast x-ray diffraction in the metal-dielectric SrRuO3/SrTiO3 superlattice
 
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research article

Comparing the oscillation phase in optical pump-probe spectra to ultrafast x-ray diffraction in the metal-dielectric SrRuO3/SrTiO3 superlattice

Bojahr, Andre
•
Schick, Daniel
•
Maerten, Lena
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2012
Physical Review B

We measured the ultrafast optical response of metal-dielectric superlattices by broadband all-optical pump-probe spectroscopy. The observed phase of the superlattice mode depends on the probe wavelength, making assignments of the excitation mechanism difficult. Ultrafast x-ray diffraction data reveal the true oscillation phase of the lattice which changes as a function of the excitation fluence. This result is confirmed by the fluence dependence of optical transients. We set up a linear chain model of the lattice dynamics and successfully simulated the broadband optical reflection by unit-cell resolved calculation of the strain-dependent dielectric functions of the constituting materials.

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Type
research article
DOI
10.1103/PhysRevB.85.224302
Web of Science ID

WOS:000305531600005

Author(s)
Bojahr, Andre
•
Schick, Daniel
•
Maerten, Lena
•
Herzog, Marc
•
Vrejoiu, Ionela
•
Schmising, Clemens von Korff
•
Milne, Chris  
•
Johnson, Steven L.
•
Bargheer, Matias
Date Issued

2012

Published in
Physical Review B
Volume

85

Article Number

224302

Subjects

Multiple-Quantum Wells

•

Acoustic Phonons

•

Coherent Phonons

•

Excitation

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
July 13, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/83826
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