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- W3004326658 abstract "The existence of quantized vortices is a key feature of Bose-Einstein condensates. In equilibrium condensates only quantum vortices of unit topological charge are stable, due to the dynamical instabilities of multiply charged defects, unless supported by strong external rotation. In this Letter we elucidate the formation, stability, coalescence and interactions of bound vortex states in trapped nonequilibrium Bose condensates such as exciton-polariton condensates pumped in a ring geometry. These bound states consist of like-signed vortices which share a single core, but whose singularities are spatially separated within the core. We propose that they may form spontaneously during the condensate formation or externally imprinted and stabilized by the particle fluxes towards the condensate center, which is a stark contrast with instability of multiply charged vortices in equilibrium condensates. We show that the maximum topological charge of these states is limited by the Kelvin-Helmholtz instability, and, therefore, by the condensate radius and pumping intensity. We show that multiply charged vortices in trapped nonconservative condensates become promising testbeds for analog gravity and for studying the fundamental physics of multiply charged vortices in quantum fluids." @default.
- W3004326658 created "2020-02-07" @default.
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- W3004326658 date "2020-01-28" @default.
- W3004326658 modified "2023-09-27" @default.
- W3004326658 title "Spontaneous Rotation, Multiply Charged Vortices, and the Kelvin-Helmholtz Instability in Nonconservative Trapped Bose Condensates" @default.
- W3004326658 hasPublicationYear "2020" @default.
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