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dc.contributor.authorShalini, Ashawaraya
dc.contributor.authorLiu, Y.
dc.contributor.authorAl-Jarah, Uday Ali Sabeeh
dc.contributor.authorSrivastava, G.P.
dc.contributor.authorWright, C. David
dc.contributor.authorKatmis, F.
dc.contributor.authorBraun, W.
dc.contributor.authorHicken, R.J.
dc.date.accessioned2013-12-02T11:19:22Z
dc.date.issued2013-10-16
dc.description.abstractThe phonon spectrum of Ge2Sb2Te5 is a signature of its crystallographic structure and underlies the phase transition process used in memory applications. Epitaxial materials allow coherent optical phonons to be studied in femtosecond anisotropic reflectance measurements. A dominant phonon mode with frequency of 3.4 THz has been observed in epitaxial Ge2Sb2Te5 grown on GaSb(001). The dependence of signal strength upon pump and probe polarization is described by a theory of transient stimulated Raman scattering that accounts for the symmetry of the crystallographic structure through use of the Raman tensor. The 3.4 THz mode has the character of the 3 dimensional T2 mode expected for the Oh point group, confirming that the underlying crystallographic structure is cubic. New modes are observed in both Ge2Sb2Te5 and GaSb after application of large pump fluences, and are interpreted as 1 and 2 dimensional modes associated with segregation of Sb.en_GB
dc.description.sponsorshipThe authors gratefully acknowledge financial support from Engineering and Physical Sciences Research Council grant EP/F015046/1en_GB
dc.identifier.citationVol. 3, article 2965en_GB
dc.identifier.doi10.1038/srep02965
dc.identifier.grantnumberEngineering and Physical Sciences Research Council grant EP/F015046/1en_GB
dc.identifier.urihttp://hdl.handle.net/10871/14108
dc.language.isoen_USen_GB
dc.publisherNature Publishing Groupen_GB
dc.relation.urlhttp://www.ncbi.nlm.nih.gov/pubmed/24129388en_GB
dc.relation.urlhttp://hdl.handle.net/10871/13760
dc.rightsOpen access. This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/
dc.subjectMaterials scienceen_GB
dc.subjectOptical data storageen_GB
dc.subjectApplied physicsen_GB
dc.subjectOptical physicsen_GB
dc.titleObservation of T2-like coherent optical phonons in epitaxial Ge2Sb2Te5/GaSb(001) films (journal article)en_GB
dc.typeArticleen_GB
dc.date.available2013-12-02T11:19:22Z
exeter.place-of-publicationEngland
dc.descriptionThe dataset associated with this article is in ORE at http://hdl.handle.net/10871/13760
dc.identifier.eissn2045-2322
dc.identifier.journalScientific Reportsen_GB


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