Second Class Exciton Structure in Stannic Oxide

概要

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A sharp line series has been found at the beginning of the fundamental optical absorption spectra of SnO_2 below 80°K for light polarized E⊥c. The series is identified as being a second class exciton structure, since it satisfies a hydrogen-like series relation beginning with n=2 quantum state and, n addition, is followed by a continuum with absorption coefficient varying as (hν-E_<gap>)^<3/2>. The results of Zeeman effect measurements are consistent with group theoretical predictions based on a crystal field-split valence band of oxygen 2p functions and a crystal field-split conduction band of Sn 5s functions, both having their extrema at k=0. By a quantitative comparison with an anisotropic-exciton-mass formalism, the effective Rydberg constant, the band gap energy and the anisotropic exciton-reduced-masses are estimated as 0.0345 eV, 3.5969 eV (at 1.8°K) and μ_x=0.33m_0, μ_z=0.30m_0, respectively.
社団法人日本物理学会の論文
1971-01-05