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- W1983588097 abstract "► Skyrmion rows and filled phase slip lines can be energetically preferred over vortex rows. ► The regime of interaction strength is found where skyrmion rows are formed. ► With strong interactions, larger shear velocities favour skyrmion rows over vortices. When a condensate is sheared by imparting a velocity to a part of the condensate, phase singularities must appear at the interface between the region that is still at rest and the region that has acquired a velocity. For helium, Feynman argued that these phase singularies will arrange themselves in the form of a vortex row. Bose–Einstein condensates of ultracold atomic gases differ from helium in that the healing length is generally much larger and is, in fact, tunable. Another difference is that multicomponent condensates can be created, where the two components forming the mixture are usually two different hyperfine states of the condensed atoms. These two components can be manipulated separately and can be interconverted. In this contribution, we investigate how these additional degrees of freedom, available in quantum gases, change what happens in sheared condensates. In particular, we consider skyrmion rows as an alternative to vortex rows, and we also consider phase slip lines filled with the second, unmoving component, in a condensate mixture. We show that depending on the ratios of the interaction strengths between the components, and depending on the shear velocity, skyrmion rows and phase slip lines can become lower in energy than vortex rows, and hence should be observable in quantum gases. Moreover, we find that the velocity field affects the stability region of the condensate with respect to phase separation." @default.
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- W1983588097 date "2012-09-01" @default.
- W1983588097 modified "2023-09-29" @default.
- W1983588097 title "Skyrmion rows, vortex rows, and phase slip lines in sheared multi-component condensates" @default.
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- W1983588097 doi "https://doi.org/10.1016/j.physc.2012.01.016" @default.
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