Sub-terahertz amplification in a semiconductor superlattice with moving charge domains
journal contributionposted on 17.04.2015 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
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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).