Sub-terahertz amplification in a semiconductor superlattice with moving charge domains
journal contributionposted on 17.04.2015, 12:56 by V.V. Makarov, Alexander E. Hramov, Alexey A. Koronovskii, Kirill Alekseev, V.A. Maximenko, Mark Greenaway, T.M. Fromhold, Olga I. Moskalenko, Alexander Balanov
We theoretically study the high-frequency response of charge domains traveling through a strongly coupled semiconductor superlattice with an applied harmonic electromagnetic signal. Our calculations show that the superlattice alone can amplify signals with a frequency close to the domain transient frequency. Moreover, we show that if the superlattice is connected to a resonator, amplification becomes possible for much higher frequencies of the external signal (several hundred GHz). These promising results open the way to using semiconductor superlattices as efficient sub-THz amplifiers.
Russian Scientific Foundation supported study of the semiconductor superlattice coupled to resonator (Grant No. 14-12-00222). M.T.G. acknowledges financial support from the Leverhulme Trust (UK).