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We experimentally investigate the phase winding dynamics of a harmonicallytrapped two-component BEC subject to microwave induced Rabi oscillationsbetween two pseudospin components. While the single particle dynamics can beexplained by mapping the system to a two-component Bose-Hubbard model,nonlinearities due to the interatomic repulsion lead to new effects observed inthe experiments: In the presence of a linear magnetic field gradient, aqualitatively stable moving magnetic order that is similar to antiferromagneticorder is observed after critical winding is achieved. We also demonstrate howthe phase winding can be used as a new tool to generate copious dark-brightsolitons in a two-component BEC, opening the door for new experimental studiesof these nonlinear features.

Phase Winding a Two-Component BEC in an Elongated Trap: Experimental Observation of Moving Magnetic Orders and Dark-bright Solitons