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Electric field effects on anisotropic excitons in lead iodide
Author(s) -
Bordas J.,
Ricco B.
Publication year - 1975
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.2220670220
Subject(s) - exciton , electric field , anisotropy , condensed matter physics , absorption edge , field (mathematics) , ground state , absorption (acoustics) , materials science , physics , atomic physics , optics , band gap , quantum mechanics , mathematics , pure mathematics
The electric field dependence of the ground state of the exciton at the fundamental absorption edge of PbI 2 is interpreted by means of a theoretical approach including anisotropy. As a result of the theoretical fit to the experimental curves the following exciton parameters are obtained: R = 16 meV, ε⟂ = 36, ε‖ = 24, a ⟂ = 20 Ǎ, a ‖ = 13 Ǎ. These estimates are used to explain satisfactorily the behaviour of the electroabsorption spectrum as well as the temperature dependence of the width of the exciton line which previous published values failed to do.