Excitons in diluted magnetic semiconductor quantum wires

As a consequence of a confinement in two spatial directions and due to the presence of p-d exchange interaction, a relative contribution of the heavy- and light-hole components of the ground state of a hole in a diluted magne tic semiconductor quantum wire depends strongly on an external magnetic fie ld. In particular, this fact leads to a magnetic field dependence of along- the-wire effective mass of the space-quantized holes and, consequently, to a magnetic field dependence of the exciton binding energy. Numerical calcul ations performed for T-shaped Cd1-x-yMnxMyTe/Cd1-xMnxTe quantum wire struct ures clearly demonstrate this additional dependence of the exciton binding energy on the magnetic field. (C) 2001 Elsevier Science B.V. All rights res erved.