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Title: Ultrafast dynamics of the dielectric functions of ZnO and BaTiO{sub 3} thin films after intense femtosecond laser excitation

The ultrafast carrier dynamics of epitaxial ZnO and BaTiO{sub 3} thin films after intense excitation at 3.10 eV and 4.66 eV photon energy has been studied by femtosecond absorption spectroscopy. Modelling the transient transmission changes on the basis of spectroscopic ellipsometry data and pertinent equilibrium model dielectric functions extended by additional terms for the effects at high carrier density (P-band luminescence and stimulated emission from electron-hole-plasma), a self-consistent parameterized description was obtained for both materials. Excited carrier lifetimes in the range of ≈2 to ≈60 ps and long-lived thermal effects after several hundred ps have been identified in both materials. These findings form a reliable basis to quantitatively describe future femtosecond studies on ZnO/BaTiO{sub 3} heterolayer systems.
Authors:
;  [1] ; ;  [2] ; ; ; ;  [3]
  1. Centre of Innovation Competence SiLi-nano, Martin-Luther-Universität Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, D-06120 Halle (Germany)
  2. Physics Institute, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120 Halle (Germany)
  3. Institute for Experimental Physics II, Universität Leipzig, Linnestraße 5, 04103 Leipzig (Germany)
Publication Date:
OSTI Identifier:
22278135
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; CARRIER DENSITY; CARRIER LIFETIME; CHARGE CARRIERS; COMPUTERIZED SIMULATION; DIELECTRIC MATERIALS; ELLIPSOMETRY; EPITAXY; EXCITATION; HETEROJUNCTIONS; LUMINESCENCE; PHOTONS; SOLID-STATE PLASMA; STIMULATED EMISSION; TEMPERATURE DEPENDENCE; THIN FILMS; TITANATES; ZINC OXIDES