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| Author(s) Dawei Wang, Aizhen Zhang, Lijun Yang, Marc M. Dignam |
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| Title Tunable terahertz amplification in optically excited biased semiconductor superlattices: Influence of excited excitonic states |
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| Publication Name Physical Review B |
Publication Type Journal |
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| Publisher Amerian Physical Society |
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| Volume 77 |
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Pages 115307 |
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Publication Year 2008 |
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| Abstract We simulate the coherent carrier dynamics of an optically excited, undoped 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 tunable terahertz gain due to excitonic effects, even in the presence of a large number of unbound excitons. We find that gain coefficients greater than 20 cm−1 can be achieved over a tuning range of 3–11 THz and that due to the coherent cascading of the carriers down the excitonic Wannier-Stark ladder, the gain coefficients have much higher gain saturation fields than comparable two-level systems. |
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| Website http://link.aps.org/abstract/PRB/v77/e115307 |
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