Stern-Gerlach deflection of vector spatio-temporal soliton pairs in cold Rydberg gases

We propose a scheme to investigate vector spatio-temporal soliton pairs via double Rydberg electromagnetically induced transparency (EIT). We show that three dimensional (3D) vector monopole and vortex solitons, with ultralow generation power and ultraslow speed, have been found under three response regions. In particular, these spatio-temporal soliton pairs experience a significant Stern-Gerlach deflection when a gradient magnetic field is applied to the system. The results reported here are useful not only for extending the research realm of nonlinear magneto-optics but also for the application in the detection of microgradient magnetic fields.