Transient optical response of quantum well excitons to intense narrowband terahertz pulses

Jameson, A. D.; Tomaino, J. L.; Lee, Yun-Shik; Prineas, J. P.; Steiner, J. T.; Kira, M.; Koch, S. W.
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p201107
Academic Journal
Intense narrowband terahertz pulses are used to modify excitonic transitions in semiconductor quantum wells and to study the dephasing properties of the optically dark 2p states. Time-resolved terahertz-pump and optical-probe measurements exhibit strong nonlinear optical transients of the 1s heavy-hole and light-hole exciton resonances when the terahertz radiation is tuned near the 1s to 2p intraexciton transition. A microscopic theory attributes the observed nonlinearities to Rabi sidebands showing that the 2p-dephasing time is three times that of the 1s-state.


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