Abstract
The dynamics of the transverse-magnetic-field-induced linear polarization of the radiation of triplet bound excitons in uniaxial crystals has been studied by time-resolved spectroscopy on an example of GaSe under resonant excitation by linearly polarized light. The linear polarization of the radiation arises due to the difference between the behaviors of its π- and σ-components in a magnetic field. It has been found that the magnetic-field dependences of the π- and σ-component intensities are functions of the pump light polarization and vary considerably with the lifetime t of the excited states. It has been revealed that the resonant excitation of excitons by light polarized with E∥B and E ⊥ B is accompanied by the magnetic-field-induced alignment of their dipole moments along the vector E of the pump light. In the case of excitation by light with E ⊥ B, the optical alignment of excitons is observed only in the initial period of their life, and the linear polarization of exciton radiation changes sign at a certain t>t 0. A theoretical description of these effects is proposed.
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Original Russian Text © A.N. Starukhin, D.K. Nelson, B.S. Razbirin, 2009, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2009, Vol. 89, No. 3, pp. 158–164.
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Starukhin, A.N., Nelson, D.K. & Razbirin, B.S. Dynamics of the magnetic-field-induced optical alignment of triplet bound excitons in GaSe under resonant excitation conditions. Jetp Lett. 89, 139–144 (2009). https://doi.org/10.1134/S0021364009030096
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DOI: https://doi.org/10.1134/S0021364009030096