Abstract
Magneto-reflectance of the direct excitons in InI and InBr is investigated in magnetic fields up to 15T at LHeT. Oscillatory structure which corresponds to the n s exciton states appears in magnetic fields in both halides. Their exciton energies are characterized by a hydrogenic exciton series in spite of the strongly anisotropic media. The binding energy of the exciton is determined as 4.2 meV, the reduced mass as 0.17 m 0 and the dielectric constant effective to the exciton binding as 24 in InI. They are 11.6 meV, 0.26 m 0 and 18 in InBr. In InI, the energy of the n s exciton state in the low field connects smoothly to that of the N = n - 2 Landau-like state in the high field region. Moreover, in InI, the oscillatory structure is accompanied by a subsidiary peak on the high energy side in high fields.
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