Chin. Phys. Lett.  2004, Vol. 21 Issue (12): 2536-2539    DOI:
Original Articles |
Optical Absorption Spectra and Intraband Dynamics in Terahertz-Driven Semiconductor Superlattice
MI Xian-Wu
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
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MI Xian-Wu 2004 Chin. Phys. Lett. 21 2536-2539
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Abstract We have theoretically investigated the optical absorption spectrum and intraband dynamics by subjecting a superlattice to both a terahertz (THz)-frequency driving field and an optical pulse by using an excitonic basis. In the presence of a THz dc field, the satellite structures in the absorption spectra are presented. The satellite structure is a result from the THz nonlinear dynamics of Wannier--Stark ladder excitons. On the other hand, the coherent intraband polarization is investigated. We find that the excitonic Bloch oscillation is driven by the THz field and yields an intraband polarization that continues to oscillate at times much longer than the intraband dephasing time. The temporal evolution of the slowly varying components of the intraband polarization is dependent on the THz frequency.
Keywords: 78.70.-g      73.21.Fg      42.65.-k     
Published: 01 December 2004
PACS:  78.70.-g (Interactions of particles and radiation with matter)  
  73.21.Fg (Quantum wells)  
  42.65.-k (Nonlinear optics)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I12/02536
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