Exciton memory functions in initially unrelaxed lattices
- 10 April 1987
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 20 (10) , 1459-1464
- https://doi.org/10.1088/0022-3719/20/10/014
Abstract
General formulae for memory functions of a single molecular exciton in an initially unrelaxed periodic lattice are made explicit by partially resuming a perturbation series to infinity. The decay time of the memory functions determining the loss of coherence is estimated and it is shown that it may exceed the usual estimates obtained from optical data using the lowest-order Kenkre-Knox relations by several orders of magnitude. Hence, the exciton motion may remain coherent and insensitive to temperature over much longer intervals following the exciton creation than is usually assumed.Keywords
This publication has 15 references indexed in Scilit:
- Memory functions for the electron-phonon systemJournal of Physics C: Solid State Physics, 1985
- Solitons, generalised master equations and small-polaron propagationJournal of Physics C: Solid State Physics, 1985
- Energy transfer by shock waves?Chemical Physics Letters, 1985
- Higher-Order Test of the Kenkre-Knox Relation for Excitonic Optical and Transport Properties of Molecular CrystalsPhysica Status Solidi (b), 1982
- Optical spectra and exciton coherenceJournal of Luminescence, 1976
- Energy transfer and spectral line shapes of impurities in crystalsThe Journal of Chemical Physics, 1975
- Exciton transport at short timesChemical Physics, 1974
- Model calculations in the theory of excitation transferPhysics Letters A, 1974
- Generalized-master-equation theory of excitation transferPhysical Review B, 1974
- On Quantum Theory of Transport PhenomenaProgress of Theoretical Physics, 1958