Results 221 to 230 of about 24,150 (266)

Luminescence due to Exciton-Electron and Exciton-Exciton Collisions in GaSe

Journal of the Physical Society of Japan, 1976
Two emission bands are observed in GaSe under N2 laser excitation at 77 K and 4.2 K. The spectral-band shapes agree with the theoretical curves for exciton-electron and exciton-exciton collision processes. Stimulated emission is ascribed to the exciton-exciton collision process.
T. Ugumori, K. Masuda, S. Namba
openaire   +1 more source

Annihilation of excitons and exciton-phonon interaction

Uspekhi Fizicheskih Nauk, 1971
This article is based on a paper given by the authors at a scientific meeting of the Division of General Physics and Astronomy of the Academy of Sciences of the USSR on May 30, 1968.
E F Gross, Sergei A Permogorov, B S Razbirin   +2 more
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Exciton-exciton annihilation in TbPO4

Solid State Communications, 1976
Abstract A pulsed tuneable dye laser has been used to create high densities of excitons in TbPO 4 by resonant optical pumping into the 5 D 4 Manifold. Non-exponential decay of the fluorescent radiation from 5 D 4 is ascribed to exciton-exciton annihilation whose rate γ n , is proportional to the exciton density n , with γ = 5 × 10 -15 cm
P.C. Diggle, K.A. Gehring, R.M. Macfarlane   +2 more
openaire   +1 more source

Kinetic theory of exciton–exciton annihilation

The Journal of Chemical Physics, 2014
Weakly excited states of dye aggregates and supramolecular complexes can be characterized by single or two exciton states. Stronger excitation results in the presence of multiple excited molecules, and complex processes of internal energy transfer dynamics take place.
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Exciton and excitonic polaron in C60

Synthetic Metals, 1995
Abstract Exciton and excitonic polaron states in C 60 molecule are studied theoretically by the tight-binding model and the extended Hubbard interaction. We find that the exciting energies of the lowest singlet and triplet excitons depend sensitively upon the electron correlation.
Q.F. Huang, R.T. Fu, R.L. Fu, H.J. Ye, Thomas F. George, X. Sun   +5 more
openaire   +1 more source

Influence of the phonon‐exciton interaction on exciton‐exciton quantum correlation in semiconductor microcavities

physica status solidi c, 2006
AbstractWe present an extension of the previous descriptions based on the Dynamics Controlled Truncation Scheme of light‐matter interaction beyond mean‐field, including the microscopic description of the exciton‐photon interaction. This enables the microscopic analysis of the influence of decoherence and noise on the polariton quantum correlations ...
PORTOLAN S, DI STEFANO O, SAVASTA, Salvatore, ROSSI F.   +3 more
openaire   +4 more sources

Exciton-exciton “collisions” in crystals

Czechoslovak Journal of Physics, 1966
The paper represents a theoretical examination of the process of the creation of a free electron in the conduction band and a free hole in the valence band from two excitons of the Wannier-Mott type under the influence of an electrostatic correlation interaction of valence electrons in dielectric and semi-conducting crystals. It can be seen that such a
openaire   +1 more source

Dephasing kinetics of a coherent exciton polarization by exciton–exciton scattering

Journal of Luminescence, 2000
Abstract A system of excitons interacting via a two-particle interaction and with an external light field is treated within a boson approximation. Equations are derived and solved numerically including both the coherent interaction of the excitons and the incoherent x–x scattering on a microscopic level.
O.M. Schmitt, L. Bányai, H. Haug
openaire   +1 more source

Exciton-exciton annihilation in organic lanthanide complexes

The Journal of Chemical Physics, 2010
We have investigated the mechanism of exciton-exciton annihilation in organic lanthanide complexes by measuring the excitation density dependence of photoluminescence yield in neat films of a model europium chelate. The observed luminescence efficiency reduction at high excitation intensities has been attributed to the operation of the mutual ...
MEZYK, JAKUB JAN, Di Nuzzo, D, MECH, AGNIESZKA, TUBINO, RICCARDO, MEINARDI, FRANCESCO   +4 more
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Exciton-Exciton Correlation in the Nonlinear Optical Regime

Physical Review Letters, 1995
We present a theory of the time development of the nonlinear optical excitations in a semiconductor in which the correlated part of the many-body problem is expressed in terms of the exact $N$-exciton eigenstates and is decoupled from the optical excitation process.
, Östreich, , Schönhammer, , Sham
openaire   +2 more sources