We investigate the stability of various ordered FeNi alloys at the interfaces of Fe/Ni superlattices by using ab initio density functional calculation. We consider an Fe<Subscript>0.5</Subscript>Ni<Subscript>0.5</Subscript> ordered alloy of one or two monolayers thick at different positions beyond the interface and the possibility of an...</subscript></subscript>

Exciton recombination dynamics in vertical stacks of InGaAs quantum rings have been studied by means of continuous wave and time resolved photoluminescence under low excitation density conditions. We have paid special attention to the effect of the carrier coupling on the exciton radiative...