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Exciton System (exciton + system)

Distribution by Scientific Domains
Physics and Astronomy100%

Selected Abstracts

Photophysics of J-aggregate microcavities

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 6 2008
P. Michetti
Abstract We have developed a model in order to account for the photo-excitation dynamics of J-aggregate films and strongly coupled J-aggregate microcavities. The J-aggregates are described as a disordered Frenkel exciton system in which relaxation occurs due to the presence of a thermal bath of molecular vibrations. The link between the J-aggregate film and the microcavities is obtained introducing a model polariton wavefunction mixing cavity photon modes and J-aggregate superradiant excitons. With the same approach we have calculated both absorption and luminescence spectra for the J-aggregate film and the photoluminescence of strongly coupled organic microcavities. The model is able to explain the organic microcavities fast relaxation dynamics and polariton luminescence following non resonant pumping starting from the excitonic properties of the optically active layer. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Interwell exciton dispersion engineering, coherent phonons generation and optical detectionof exciton condensate

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 1 2004
Yu. E. Lozovik
This issue's Editor's Choice [1] discusses interwell excitons in coupled quantum wells as a candidate for observation of different phases in an exciton system, including the very interesting phenomenon of Bose condensation. The cover picture shows schematically how the generation of coherent phonons and the angular distribution of the exciton photoluminescence (PL) from the quantum well system can be controlled by the external electric and magnetic fields. The first author, Yurii E. Lozovik, is head of the Laboratory of Spectroscopy of Nanostructures at the Institute of Spectroscopy and also Professor of Physics at the Moscow Physical and Technical Institute. His main interests are electron and electron,hole systems in nanostructures, cluster physics, quantum electrodynamics in a cavity, matter in strong magnetic fields, nanotechnology, ultrafast and near field optics, and computer simulations. [source]

Parametric interactions and nonlinear Raman processes of vibronic excitons in polydiacetylene studied with a two-optical-cycle laser

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 1 2009
Takayoshi Kobayashi
Abstract Sum and difference frequency mixing, which are the analogues of the second-order nonlinear optical processes were for the first time found in vibronic exciton systems under high-density excitations. Cascaded nonlinear Raman scattering was for the first time observed in the exciton system of PDA. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]