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Coherent optical phonons in different phases of Ge2 Sb 2 Te5 upon strong laser excitation

AuthorsHernández Rueda, Javier ; Savoia, A.; Gawelda, W.; Solís Céspedes, Javier ; Mansart, B.; Boschetto, D.; Siegel, Jan
Issue Date2011
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 98: 251906 (2011)
AbstractThe transient reflectivity response of phase-change Ge2 Sb 2 Te5 films to intense femtosecond laser pulses is studied by ultrafast coherent phonon spectroscopy. The three different phases (amorphous, fcc-, and hcp-crystalline), as well as laser-crystallized films, are investigated, featuring different photoexcited carrier and coherent optical phonon dynamics. At least two main phonon frequencies are identified for each phase/material and their evolution for increasing pump fluences is investigated for the fcc-crystalline phase and the laser-crystallized material, revealing strong differences. We find evidence that a considerable fraction of amorphous phase remains in the laser-crystallized material, which features a different phonon frequency, not related to other phases. These results are important for emerging strategies aimed at driving ultrafast phase transitions via coherent phonon excitation for applications in data storage. © 2011 American Institute of Physics.
Identifiersdoi: 10.1063/1.3601478
issn: 0003-6951
Appears in Collections:(CFMAC-IO) Artículos
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