Abstract-Superlattice gain in positive differential conductivity region

David O. Winge, Martin Franckié, Andreas Wacker

(Submitted on 5 Jan 2016)

http://arxiv.org/abs/1601.00915

We analyze theoretically a superlattice structure proposed by A. Andronov et al. [JETP Lett 102, 207 (2015)] to give gain in the Terahertz region. The existence of gain is confirmed but it is found to be strongly affected by elastic scattering, which limits the peak value. It is shown that the dephasing strongly modifies the nature of the relevant states, so that the common analysis based on Wannier Stark states is not reliable for a quantitative description of the gain in structures with extremely diagonal transitions.