1Institute of Theoretical Physics and Department of Physics, Shanxi University, Taiyuan 030006 2HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 3Institute of Applied Physics and Computational Mathematics, Beijing 100088
Abstract：The three-dimensional electron–electron correlation in an elliptically polarized laser field is investigated based on a semiclassical model. Asymmetry parameter $\alpha$ of the correlated electron momentum distribution is used to quantitatively describe the electron–electron correlation. The dependence of $\alpha$ on ellipticity $\varepsilon$ is totally different in three directions. For the $z$ direction (major polarization direction), $\alpha$ first increases and reaches a maximum at $\varepsilon=0.275$, then it decreases quickly. For the $y$ direction in which the laser field is always absent, the ellipticity has a minor effect, and the asymmetry parameter fluctuates around $\alpha=-0.15$. However, for the $x$ direction (minor polarization direction), $\alpha$ increases monotonously with ellipticity though starts from the same value as in the $y$ direction when $\varepsilon=0$. The behavior of $\alpha$ in the $x$ direction actually indicates a transformation from the Coulomb interaction dominated correlation to the laser field dominated correlation. Therefore, our work provides an efficient way to control the three-dimensional electron–electron correlation via an elliptically polarized intense laser field.
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2017, Vol. 34 
