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Excitons in Motion in CdTe, ZnTe and ZnSe
J. J. Davies,L. C. Smith,D. Wolverson,H. Boukari,R. T. Cox,H. Mariette,J. Cibert 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We report remarkable changes in the magnetic properties of excitons as they acquire kinetic energy in wide (001) quantum wells of CdTe, ZnSe, ZnTe and GaAs. In particular, the magnetic moments (g-values) when magnetic fields are applied in the growth direction are shown to have a strong dependence on the translational wavevector Kz. The dependence is particularly marked when Kz is of the order of the inverse of the exciton Bohr radius or, equivalently, when the translational kinetic energy becomes comparable with the exciton Rydberg. The behaviour is ascribed to motionallyinduced mixing between the 1S hydrogenic exciton ground state and excited nP states and is describable by what appears to be a universal formula.