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Transformation of Excitonic Spectra of PbI 2 Layer Crystals under Order‐Disorder‐Order Structural Transistions
Author(s) -
Bibik V. A.,
Davydova N. A.
Publication year - 1989
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.2221510234
Subject(s) - stacking , exciton , spectral line , irradiation , materials science , perpendicular , laser , condensed matter physics , translational symmetry , layer (electronics) , transformation (genetics) , order (exchange) , symmetry (geometry) , molecular physics , crystallography , optics , chemistry , physics , nanotechnology , nuclear magnetic resonance , quantum mechanics , geometry , mathematics , finance , economics , biochemistry , gene
The influence of ruby laser irradiation on the exciton spectra of PbI 2 crystals of 2H and 4H poly‐types is studied. It is shown that the first pulses of laser irradiation lead to the creation of one‐dimensional disorder due to generation of stacking faults. The presence of stacking disorder leads to a localization of the excitonic wave functions in the direction perpendicular to the layer packets, causing a “fine” structure of the exciton band. The repeated irradiation leads to stacking faults ordering into the high‐symmetry 2H polytype, which has a shorter translational period in comparison with other polytypes and, thus requires less time for its ordering.