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Pis'ma v Zh. Èksper. Teoret. Fiz., 2009, Volume 89, Issue 3, Pages 158–164 (Mi jetpl355)  

CONDENSED MATTER

Dynamics of the magnetic-field-induced optical alignment of triplet bound excitons in GaSe under resonant excitation conditions

A. N. Starukhin, D. K. Nelson, B. S. Razbirin

Ioffe Physico-Technical Institute, Russian Academy of Sciences

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 EB and EB 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 EB, 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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English version:
Journal of Experimental and Theoretical Physics Letters, 2009, 89:3, 139–144

Bibliographic databases:

PACS: 71.35.Ji, 78.20.Ls, 78.47.Cd, 78.55.Hx
Received: 29.12.2008

Citation: A. N. Starukhin, D. K. Nelson, B. S. Razbirin, “Dynamics of the magnetic-field-induced optical alignment of triplet bound excitons in GaSe under resonant excitation conditions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 89:3 (2009), 158–164; JETP Letters, 89:3 (2009), 139–144

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