Quantum derivatives and terahertz gain in a superlattice |
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| Authors: | A V Shorokhov K N Alekseev |
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| Affiliation: | (1) Ogarev Mordovian State University, Saransk, 430000, Russia;(2) University of Oulu, Oulu, 90579, Finland |
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| Abstract: | Simple formulas describing terahertz absorption and gain in a semiconductor superlattice irradiated by a microwave pump field are derived for the case when the signal frequency is a half harmonic of the pump. A simple qualitative analysis provides a geometric interpretation of the derived formulas, which can be used to determine if gain is feasible. |
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