Giant nonlinear absorption in the NiO antiferromagnet

Giant nonlinear absorption in the NiO antiferromagnet

A study of the spectrum of nonlinear two-photon and two-step absorption in NiO single crystals, carried out in the energy region ℏω1 + ℏω2 = 2.45–4.575 eV, showed it to have a complex shape and consist of very strong peaks (from 0.05 to 2.7 cm/MW). Within the energy interval 2.45–3.3 eV, the spectru...

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Veröffentlicht in:Physics of the solid state 2003-09, Vol.45 (9), p.1742-1745
Hauptverfasser: Shablaev, S. I., Pisarev, R. V.
Format: Artikel
Sprache:eng
Schlagworte:
Absorption
Antiferromagnetism
Conduction bands
Nickel oxides
Single crystals
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Zusammenfassung:A study of the spectrum of nonlinear two-photon and two-step absorption in NiO single crystals, carried out in the energy region ℏω1 + ℏω2 = 2.45–4.575 eV, showed it to have a complex shape and consist of very strong peaks (from 0.05 to 2.7 cm/MW). Within the energy interval 2.45–3.3 eV, the spectrum is due to d-d transitions in the Ni2+ ion. The band gap width was determined to be Eg=3.466 eV. The spectral features seen above this energy originate from interband transitions from three valence subbands to the conduction band bottom.
ISSN:1063-7834
1090-6460
DOI:10.1134/1.1611243