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Stability of stationary three-wave interactions in homogeneous and infinite systems (1989)

Pietsch, H. ; Blaha, R. ; Laedke, E. W. ; [weitere]

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 1 (1989), S. 286-292

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: One-dimensional three-wave models, known for stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS), are investigated. It is shown that in homogeneous systems of infinite extent the steady-state three-wave solution for SBS with a reflectivity less than 100% is intrinsically unstable. From a numerical solution it is concluded that nearly all stationary states decay in time and result in a state with reflectivity coefficient R=1; only the latter is linearly stable in a homogeneous plasma of infinite length. The asymptotic solutions for SBS in plasmas are calculated and the similarity in the dynamics between SBS and SRS is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.859194

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Large piezoelectricity in electric-field modified single crystals of SrTiO3 (2016)

B. Khanbabaee, E. Mehner, C. Richter, J. Hanzig, M. Zschornak, U. Pietsch, H. Stöcker, T. Leisegang, D. C. Meyer and S. Gorfman

American Institute of Physics (AIP)

In: Applied Physics Letters

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Publikationsdatum: 2016-11-30

Beschreibung: Defect engineering is an effective and powerful tool to control the existing material properties and produce completely new ones, which are symmetry-forbidden in a defect-free crystal. For example, the application of a static electric field to a single crystal of SrTiO 3 forms a strained near-surface layer through the migration of oxygen vacancies out of the area beneath the positively charged electrode. While it was previously shown that this near-surface phase holds pyroelectric properties, which are symmetry-forbidden in centrosymmetric bulk SrTiO 3 , this paper reports that the same phase is strongly piezoelectric. We demonstrate the piezoelectricity of this phase through stroboscopic time-resolved X-ray diffraction under alternating electric field and show that the effective piezoelectric coefficient d 33 ranges between 60 and 100 pC/N. The possible atomistic origins of the piezoelectric activity are discussed as a coupling between the electrostrictive effect and spontaneous polarization of this near-surface phase.

Print ISSN: 0003-6951

Digitale ISSN: 1077-3118

Thema: Physik

Publiziert von American Institute of Physics (AIP)

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