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Author(s)
     Dawei Wang, Aizhen Zhang, Lijun Yang, Marc M. Dignam
Title
     Tunable terahertz amplification in optically excited biased semiconductor superlattices: Influence of excited excitonic states
Publication Name
     Physical Review B
Publication Type
     Journal
Publisher
     Amerian Physical Society
Place
     
Editor(s)
     
Number
     
School
     
Volume
      77
Chapter
     
Pages
      115307
Other Publication Information
     
Publication Year
     2008
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 311 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.
Keywords
     
Website
     http://link.aps.org/abstract/PRB/v77/e115307
Paper Status
     Published
DOI / Publication ID
     



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