In this work we study the formation of neutral and negatively charged excitons in double barrier resonant tunnelling structures, by analyzing the dependence of photoluminescence emission on excitation intensity. At low excitation intensities, the negatively charged to neutral exciton intensity ratio depends linearly on the current, suggesting the validity of the concept of thermal equilibrium i...

A planar phase space having both position and momentum noncommutativity is defined in a more inclusive setting than that considered elsewhere. The dynamics of a particle in a gravitational quantum well in this space is studied. The use of the WKB approximation and the virial theorem enable analytic discussions on the effect of noncommutativity. Consistent results are obtained following either c...