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We simulate the coherent carrier dynamics of an optically-excited, updoped AlGaAs superlattice in the presence of a Terahertz pulse using an excitonic formalism that includes 1s excitonic states as well as higher in-plane excited states and allows for dephasing and population decay. We show that this system exhibits large tunable terahertz gain due to excitonic effects, even in the presence of large...
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