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Two‐Photon Spectroscopy of PbMoO 4 Single Crystals Indirect Interband Transitions
Author(s) -
Efendiev Sh.,
Darvishov N.,
Shakhdgan S.,
Gavryushin V.,
Raciukaitis G.,
Puzonas G.,
Kazlauskas 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.2221560233
Subject(s) - phonon , brillouin zone , exciton , crystal (programming language) , absorption edge , spectroscopy , absorption (acoustics) , photon energy , photon , absorption spectroscopy , atomic physics , materials science , condensed matter physics , band gap , physics , optics , quantum mechanics , computer science , programming language , composite material
Abstract Two‐photon interband absorption spectra are obtained first in PbMoO 4 crystals. They are shown to be attributed to indirect two‐photon absorption (TPA) with the assistance of phonons to exciton state formed band transitions with the extrema in different points of the Brillouin zone. The energy parameters of excitons E ex i = 3.56 (80 K) and 3.53 eV (300 K), E b i = 50 meV, of phonons (65, 180, and 270 meV), and of the interband absorption edge E g i = 3.61 (80 K) and 3.58 eV (300 K) are obtained. Anomalously high efficiency of electron–phonon interaction is found in crystals studied. The phonon energy observed in TPA at indirect transitions is shown to be determined probably by joint participation of several active phonon modes of MoO 4 −2 tetrahedral group in PbMoO 4 crystal.