Abstract
The magneto-optical properties of the ls exciton in TIC! associated with the direct transition at the X point in Brillouin zone are .studied theoretically and experimentally. It is found that the triplet exciton state as well as the longitudinal exciton state becomes observable in a certain configuration of the light and the magnetic field. These results are analyzed by the theory based on the exciton exchange interaction. The electron-hole intravalley exchange energies for the two exciton polarizations are obtained as 2. 7 and 1.5 me V. The effective g value of exciton parallel to the valley direction is estimated to be 3.4.
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