Article overview

Evidence for intervalence band coherences in semiconductor quantum wells via coherently coupled optical Stark shifts
M E Donovan ; A Schülzgen ; J Lee ; P A Blanche ; N Peyghambarian ; G Khitrova ; H M Gibbs ; I Rumyantsev ; N H Kwong ; R Takayama ; Z S Yang ; R Binder ;
Date:	3 Dec 2001
Journal:	Phys Rev Lett, 87 (23), 237402
Abstract:	We report the experimental observation of coherently coupled heavy-hole-light-hole Stark shifts, i.e., light-hole exciton shifts under heavy-hole exciton pumping conditions, in InGaAs quantum wells. The theoretical analysis of the data is based on a full many-body approach (dynamics-controlled truncation formalism) in the third-order nonlinear optical regime. It is shown that the Stark shift data can be interpreted as strong evidence of suitably defined nonradiative intervalence band coherences in a semiconductor quantum well. Hence, the observations establish a semiconductor analog of Raman coherences in three-level atoms.
Source:	PubMed, pmid11736475
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