Abstract
The possibility of manipulating the electronic states very rapidly by means of light beams is one of the reasons for the success of semiconductor optoelectronics. A well known example is the excitonic ac Stark shift in quantum wells:1,2 the excitonic absorption line is blueshifted by shining on the sample an intense laser pulse, whose frequency is lower than the exciton transition frequency.
© 2001 Optical Society of America
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