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We studied the excitation transfer in double quantum wells of a diluted magnetic semiconductor using a scanning near-field optical microscope at 7 K in external magnetic fields up to 9 T. In each quantum well, local energy minima are generated by local fluctuation of layer thickness and doping concentration of magnetic components. Excitons relax into the local energy minima and transfer between the...
We have made aferromagnetic (Ni) dot structure buried in semiconductor quantum wires by two-step surface modifications with STM. The wire was atype of split-gate, and the hole in which the Ni was buried was in the form of asmall reversed cone (200nm upper diameter and 100nm depth). This size was selected in order to observe strong spin-selected transports, because we adopted apseudomorphic heterojunction...
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