Comparing the oscillation phase in optical pump-probe spectra to ultrafast x-ray diffraction in the metal-dielectric SrRuO3/SrTiO3 superlattice
- 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.
| Author details: | Andre BojahrGND, Daniel Schick, Lena Märten, Marc HerzogORCiDGND, Ionela Vrejoiu, Clemens von Korff Schmising, Chris Milne, Steven Lee Johnson, Matias BargheerORCiDGND |
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| DOI: | https://doi.org/10.1103/PhysRevB.85.224302 |
| ISSN: | 1098-0121 |
| Title of parent work (English): | Physical review : B, Condensed matter and materials physics |
| Publisher: | American Physical Society |
| Place of publishing: | College Park |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2012 |
| Publication year: | 2012 |
| Release date: | 2017/03/26 |
| Volume: | 85 |
| Issue: | 22 |
| Number of pages: | 6 |
| Funding institution: | BMBF [03WKP03A]; Deutsche Forschungsgemeinschaft (DFG) [BA2281/3-1] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
