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Interband absorption and the Γ‐point band structure parameters in HgSe
Author(s) -
Szuszkiewicz W.
Publication year - 1979
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.2220910142
Subject(s) - absorption (acoustics) , atomic physics , electronic band structure , attenuation coefficient , band gap , liquid helium , chemistry , molecular physics , materials science , analytical chemistry (journal) , condensed matter physics , helium , optics , physics , chromatography
Abstract Optical absorption in HgSe crystals is measured in a wide energy range (0.04 to 0.9 eV). Transmission experiments are carried out at seven temperatures from 10 to 295 K. Very thin samples with electron concentration ranging from 4 × 10 17 to 2 ± 10 18 cm −3 at helium temperature are used (the absorption coefficient is measured up to 3 × 10 4 cm −1 ). Direct optical transitions Γ 6 v→ Γ 8 c , manifesting themselves as a „step” on the absorption curve, are observed at low temperatures. The relationship between the value of the negative energy gap E 0 and the value of the spin–orbit splitting Δ is determined from the energy of the front of the „step” as a function of temperature. The absorption coefficient for HgSe is calculated numerically using Kane's formulae for the inverted band structure. The finite value of the spin–orbit splitting Δ and the parameters describing the interactions with „higher bands” are taken into account. A new set of band structure parameters ( E 0 , d E 0 /d T , P , Δ, A ′, L ′, M , L – M – N ) is obtained. This set can explain the data measured as well as previous experimental results.