x / y / -20 -10 0 10 20 -20 -10 0 10 20 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 (c ) x / y / -20 -10 0 10 20 -20 -10 0 10 20 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 (f) x / y / -20 -10 0 10 20 -20 -10 0 10 20 (a) x / y / -20 -10 0 10 20 -20 -10 0 10 20 (b) x / y / -20 -10 0 10 20 -20 -10 0 10 20 (e) x / y / -20 -10 0 10 20 -20 -10 0 10 20 (d) FIG. 2: (color online) The momentum currents for the model [W] under the condition θ = π/ 360. First row: Left circularly polarized wavepacket σ = +1. Second row: Right circularly polarized wavepacket σ = − 1. The background distribution is depicted as the longitudinal currents and the green arrows is described as the transverse currents. [(a), (d)] Orbital momentum currents p [W] O . [(b), (e)] Spin momentum currents p [W] S . [(c), (f)] Total momentum currents p [W] O + p [W] S . The cross section is chosen as z = z$_{R}$ and the intensity is plotted in normalized units. 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]. 8