Oscillatory Magneto-Optical Absorption and Exciton-Phonon Interaction in Thallous Halides

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Oscillatory magneto-absorptions due to excitons have been studied in TlCl and TlBr. In zero magnetic field, absorptions due to exciton-phonon quasibound state and one and two free-phonon states of exciton quasicontinuum are observed. In magnetic field, members of s exciton series with a subsidiary peak on the high energy side appear. The exciton binding energy is 11.7 meV in TlCl and 9.8 meV in TlBr and the reduced mass is 0.244m0 in TlCl and 0.234m0 in TlBr. A direct evidence of exciton polaron effect is obtained by observing the clamping of zero-phonon exciton lines of high quantum number in the vicinity of one free-phonon threshold of 2s exciton. Above the threshold, absorptions of another series grow as the field increases. They are one-phonon replicas of zero-phonon excitons in magnetic field. The existence of two minima in the conduction band of each halide is suggested.

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