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Ground-state multiquantum vortices in rotating two-species superfluids

2015; American Physical Society; Volume: 91; Issue: 4 Linguagem: Inglês

10.1103/physreva.91.043605

1538-4446

Pekko Kuopanportti, Н. В. Орлова, M. V. Miloševıć,

Pulsars and Gravitational Waves Research

We show numerically that a rotating, harmonically trapped mixture of two Bose-Einstein-condensed superfluids can, contrary to its single-species counterpart, contain a multiply quantized vortex in the ground state of the system. This giant vortex can occur without any accompanying single-quantum vortices, may either be coreless or have an empty core, and can be realized in a $^{87}$Rb-$^{41}$K Bose-Einstein condensate. Our results not only provide a rare example of a stable, solitary multiquantum vortex but also reveal exotic physics stemming from the coexistence of multiple, compositionally distinct condensates in one system.