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VOLUME 61 (1995) | ISSUE 4 | PAGE 279
Interference exciton states in systems of quantum wells
The exciton spectra of asymmetric semiconductor type-I heterostructures may undergo a radical restructuring as the geometric parameters of the quantum wells and barriers are varied. If the nonparabolicity of the dispersion for one-particle excitations is pronounced, to the point that the effective mass changes sign in certain hole subbands, some of the excitons may have anomalously large binding energies over extremely broad ranges of these parameters. On the other hand, there may be cases in which bound states do not arise at all.© 1995 American Institute of Physics.