TY  - JOUR
A1  - Bojahr, Andre
A1  - Schick, Daniel
A1  - Märten, Lena
A1  - Herzog, Marc
A1  - Vrejoiu, Ionela
A1  - von Korff Schmising, Clemens
A1  - Milne, Chris
A1  - Johnson, Steven Lee
A1  - Bargheer, Matias
T1  - Comparing the oscillation phase in optical pump-probe spectra to ultrafast x-ray diffraction in the metal-dielectric SrRuO3/SrTiO3 superlattice
T2  - Physical review : B, Condensed matter and materials physics
N2  - 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.
Y1  - 2012
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/35820
SN  - 1098-0121
VL  - 85
IS  - 22
PB  - American Physical Society
CY  - College Park
ER  -