Premium
Magnetic circular dichroism of indirect excitonic transitions in GaP and In 1 ‐ x Ga x P
Author(s) -
Donecker J.,
Kluge J.
Publication year - 1976
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.2220770123
Subject(s) - magnetic circular dichroism , absorption edge , exciton , sign (mathematics) , condensed matter physics , magnetic field , phonon , x ray magnetic circular dichroism , absorption (acoustics) , spectral line , enhanced data rates for gsm evolution , wavelength , molecular physics , absorption spectroscopy , chemistry , materials science , physics , optics , band gap , quantum mechanics , mathematical analysis , telecommunications , mathematics , computer science
Measurements of the magnetic circular dichroism (MCD) of the indirect absorption edge of intrinsic GaP and In 1‐x Ga x P (x ≧ 0.77) at temperatures from 2.5 to 300 K and at magnetic fields up to 52 kOe are reported. The fine structure of the indirect absorption edge is well resolved. The MCD peaks corresponding to LA and TA assisted indirect transitions have the same shape as the corresponding peaks in the wavelength modulated spectra, but the latter have different signs. That means that the thresholds of the indirect absorption edge are rigidly shifted by the magnetic field and the direction of the shift is connected with the type of the phonons. Additionally an MCD peak appears in mixed crystals which corresponds to the no‐phonon transition. It has the same sign as the LA‐MCD peak. An attempt is made to interprete the experimental results by group theory within an exciton model. Further theoretical effort is necessary for a satisfactory explanation.