Coherence and correlation in semiconductor microcavities

✍ Scribed by O. Di Stefano; S. Savasta; R. Girlanda

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 153 KB
• Volume: 1
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200410127

✦ Synopsis

We present an overview of our results concerning the
influence of two-pair continuum coherences on the transient
nonlinear optical response of semiconductor microcavities. We show
that the interplay between these 4-particle coherences and the
nonperturbative light-matter interaction produces highly desirable
almost decoherence-free exciton-exciton collisions on the lower
polariton branch. This effect gives rise to the very different
nonlinear absorption rates on the two polariton branches observed
in many experiments and make possible to reach a very high degree
of amplification in samples with large Rabi splitting. Moreover,
we show that the availability of almost decoherence free
exciton-exciton collisions can be used for the realization of
coherent trapping of polariton emission and amplification. This
coherent manipulation and trapping of many-particle polariton
states can be performed employing both ultrafast and continuous
wave operation.