Spin correlations in nonlinear optical spectroscopy of semiconductor quantum wells

Summary form only given. The role of many-body correlations in the nonlinear optical spectroscopy of semiconductors has been extensively investigated during the last decade. More recently, there has been a growing interest in the coherent charge and spin dynamics of Fermi sea (FS) systems at low temperatures. Here we suggest a novel many-body effect in the nonlinear absorption of a FS system with a deep impurity level which originates from spin correlations between photoexcited carries and the Fermi sea. We note that a number of different intermediate processes contribute to the third order optical susceptibility.