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Optical and Magnetooptical Absorption in Pure HgTe
Author(s) -
Saleh A. S.,
Fan H. Y.
Publication year - 1972
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.2220530116
Subject(s) - absorption (acoustics) , photon energy , wavelength , electron , effective mass (spring–mass system) , two photon absorption , atomic physics , magnetic field , photon , infrared , free carrier absorption , band gap , range (aeronautics) , materials science , conduction band , thermal conduction , condensed matter physics , chemistry , optics , physics , optoelectronics , laser , nuclear physics , quantum mechanics , composite material
Infrared absorption in pure, n‐type HgTe has been studied in the wavelength range 3.5 to 35 μm. At ≈ 12 °K, the absorption continues to decrease with decreasing photon energy showing that the energy gap is < 40 meV. The absorption at 300 °K rises with decreasing photon energy after passing a minimum at ≈ 55 meV, due to effect of free carriers. Under an applied magnetic field, up to 30 kG, the absorption at a fixed wavelength shows oscillatory variation with the field strength. These oscillations give a determination of the effective mass and the g ‐factor of conduction electrons, and show that the energy gap is close to zero.