Abstract
Abstract The dynamical evolution of two-component Bose–Einstein condensates trapped in cylindrical well is numerically investigated by solving the coupled Gross–Pitaevskii equations. We illustrate that, due to intercomponent interaction and different initial component populations ( n 1 n 2 ), different numbers of ring dark (gray) solitons are generated in two components at same time. These solitons have density zeros (minima) accompanied with phase jumps, which cause large superfluid velocities. We also illustrate that at phase jump points ring dark solitons have zero superfluid currents, while ring gray solitons have large superfluid currents. They are unstable and will evolve into other soliton states after a brief time.
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