Terahertz excitation of a coherent three-level Λ-type exciton-polariton microcavity mode

Details Terahertz excitation of a coherent three-level Λ-type exciton-polariton microcavity mode Terahertz excitation of a coherent three-level Λ-type exciton-polariton microcavity mode

2011-12-09

arxiv.org/abs/1112.2185v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

Interactions of few-cycle terahertz pulses with the induced optical polarization in a quantum-well microcavity reveal that the lower and higher exciton-polariton modes together with the optically forbidden 2p-exciton state form a unique {\Lambda}-type three-level system. Pronounced nonlinearities are observed via time-resolved strong-terahertz and weak-optical excitation spectroscopy and explained with a fully microscopic theory. The results show that the terahertz pulses strongly couple the exciton-polariton states to the 2p-exciton state while no resonant transition between the two polariton levels is observed.

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