%0 Journal Article %T Active conductivity of plane two-barrier resonance tunnel structure as operating element of quantum cascade laser or detector %A M.V. Tkach %A Ju.O. Set %A V.O. Matijek %A O.M. Voitsekhivska %J Condensed Matter Physics %D 2011 %I Institute for Condensed Matter Physics %X Within the model of rectangular potentials and different effective masses of electrons in different elements of plane two-barrier resonance tunnel structure there is developed a theory of spectral parameters of quasi-stationary states and active conductivity for the case of mono-energetic electronic current interacting with electromagnetic field. It is shown that the two-barrier resonance tunnel structure can be utilized as a separate or active element of quantum cascade laser or detector. For the experimentally studied In0.53Ga0.47As/In0.52Al0.48As nano-system it is established that the two-barrier resonance tunnel structure, in detector and laser regimes, optimally operates (with the biggest conductivity at the smallest exciting current) at the quantum transitions between the lowest quasi-stationary states. %K resonance tunnel structure %K conductivity %K quantum laser %K quantum detector %U http://dx.doi.org/10.5488/CMP.14.23704