Physical principles of the amplification of electromagnetic radiation due to negative electron masses in a semiconductor superlattice
journal contributionposted on 17.08.2017, 15:21 by Aleksei V. Shorokhov, Nikolai A. Pyataev, Nikolai N. Khvastunov, Timo Hyart, Feodor Kusmartsev, Kirill Alekseev
In a superlattice placed in crossed static electric and magnetic fields, under certain conditions, the inversion of electron population can appear at which the average energy of electrons is above the middle of the mini-band and the effective mass of the electron is negative. This is the implementation of the negative effective mass amplifier and generator (NEMAG) in the superlattice. It can result in the amplification and generation of terahertz radiation even in the absence of negative differential conductivity.
This work was supported by the Ministry of Education and Science of the Russian Federation (project no. 2.2665.2014), by the Engineering and Physical Sciences Research Council (United Kingdom, grant no. EP/I01490X/1), by the Royal Society (United Kingdom–India Collaboration), and, in part, by the Ministry of Education and Science of the Russian Federation (state contract no. 11.519.11.3023).