content_image/340924.jpg
<img src='content_image/340924.jpg'>

in this polarization model [Figs. 3(b) and 3(e)]. However, the transverse spin currents are polarization-dependent and the longitudinal spin currents are absent [Figs. 3(b) and 3(e)]. For the left circular polarization σ = +1, the total transverse momentum currents present an anticlockwise circulation [Fig. 3(c)]. For the right circular polarization σ = − 1, the total transverse momentum currents present a clockwise circulation [Fig. 3(f)]. The transverse intensity distribution of this model is axially symmetric and the polarization- dependent rotation, if it exists, cannot be observed directly. This is a possible reason why the polarization-dependent split is observed only on the plane which is not perpendicular to the propagation direction of the beam [10]. 

