Theory of spin precession monitored by laser pulse

Details Theory of spin precession monitored by laser pulse Theory of spin precession monitored by laser pulse

2004-04-30

arxiv.org/abs/cond-mat/0404744v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages + 1 figure

Scientific paper

10.1016/j.ssc.2004.06.025

We first predict the splitting of a spin degenerate impurity level when this impurity is irradiated by a circularly polarized laser beam tuned in the transparency region of a semiconductor. This splitting, which comes from different exchange processes between the impurity electron and the virtual pairs coupled to the pump beam, induces a spin precession around the laser beam axis, which lasts as long as the pump pulse. It can thus be used for ultrafast spin manipulation. This effect, which has similarities with the exciton optical Stark effect we studied long ago, is here derived using the concepts we developed very recently to treat many-body interactions between composite excitons and which make the physics of this type of effects quite transparent. They, in particular, allow to easily extend this work to other experimental situations in which a spin rotates under laser irradiation.

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