Intraband dynamics and terahertz emission in biased semiconductor superlattices coupled to double far-infrared pulses |
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Authors: | Li Min and Mi Xian-Wu |
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Institution: | College of Physics Science and Information Engineering, Jishou University, Jishou 416000, China |
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Abstract: | This paper studies both the intraband polarization and
terahertz emission of a semiconductor superlattice in combined dc and
ac electric fields by using the superposition of two identical time
delayed and phase shifted optical pulses. By adjusting the delay
between these two optical pulses, our results show that the
intraband polarization is sensitive to the time delay. The peak
values appear again for the terahertz emission intensity due to the
superposition of two optical pulses. The emission lines of terahertz
blueshift and redshift in different ac electric fields and dynamic
localization appears. The emission lines of THz only appear to
blueshift when the biased superlattice is driven by a single optical
pulse. Due to excitonic dynamic localization, the terahertz emission
intensity decays with time in different dc and ac electric fields.
These are features of this superlattice which distinguish it from a
superlattice generated by a single optical pulse to drive it. |
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Keywords: | density matrix theory semiconductor superlattice terahertz emission |
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