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Skyrmions in a ferromagnetic Bose−Einstein condensate

By U. Al Khawaja and H.T.C. Stoof


Multi-component Bose-Einstein condensates provide opportunities\ud to explore experimentally the wealth of physics associated\ud with the spin degrees of freedom. The ground-state properties and line-like vortex excitations of these quantum\ud systems have been studied theoretically. In principle, nontrivial\ud spin textures consisting of point-like topological excitations, or\ud skyrmions, could exist in a multi-component Bose-Einstein\ud condensate, owing to the superfluid nature of the gas. Although\ud skyrmion excitations are already known in the context of nuclear\ud physics and the quantum-Hall effect, creating these excitations in\ud an atomic condensate would offer an opportunity to study their\ud physical behaviour in much greater detail, while also enabling an\ud ab initio comparison between theory and experiment. Here we\ud investigate theoretically the stability of skyrmions in a fictitious\ud spin-1/2 condensate of 87Rb atoms. We find that skyrmions can\ud exist in such a gas only as a metastable state, but with a lifetime\ud comparable to (or even longer than) the typical lifetime of the\ud condensate itself

Topics: Natuur- en Sterrenkunde
Year: 2001
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