Premium
Light‐Induced Ferrielectric Structures in Exciton Systems in Molecular Crystals
Author(s) -
Izvekov S. V.,
Sugakov V. I.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221730215
Subject(s) - exciton , dipole , condensed matter physics , stratification (seeds) , dissipative system , polarization (electrochemistry) , crystal (programming language) , materials science , physics , molecular physics , chemistry , thermodynamics , quantum mechanics , seed dormancy , germination , botany , dormancy , computer science , biology , programming language
The possibility of spatial stratification of excitons and polarization in molecular crystals with traps for excitons at stationary pumping is considered. Such a structure can exist only under external irradiation and may be considered as an example of a dissipative structure which can arise in nonequilibrium systems. The numerical calculations are carried out for α‐benzophenon crystals. It is shown that at some critical values of pumping rate and crystal temperature the homogeneous density of excitons becomes unstable and spatial stratification of excitons arises in the crystal. The dipole moment of the elementary cell becomes uncompensated and a periodically changing dipole moment exists. The critical values of pumping rate and crystal temperature and the period of the spatial stratification of exciton density are calculated.