,Propagation of dark soliton interacting with domain wall in two immiscible Bose-Einstein condensate

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Reflection and transmission are two behaviors of wave propagating to an interface.The immiscible binary mixtures of Bose-Einstein condensates can form the symmetry-breaking state,in which the domain wall on the center can serve as the interface.In this study,we explore in detail the propagation of a dark soliton interacting with the domain wall in the harmonic trap.We find that the low-energy dark soliton is easy to form the transmission and the high-energy dark soliton trends to reflect from the domain wall.Both reflection and transmission of dark soliton on the domain wall induce the sound radiation.But the sound radiation in the reflection derives from the collective oscillation of condensates,and it in the transmission comes not only from the collective oscillation,but also from the condensate filling in the dark soliton.
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