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Excitation of knotted vortex lines in matter waves.

Maucher, F. and Gardiner, S.A. and Hughes, I.G. (2016) 'Excitation of knotted vortex lines in matter waves.', New journal of physics., 18 (6). 063016.


We study the creation of knotted ultracold matter waves in Bose–Einstein condensates via coherent two-photon Raman transitions with a Λ level configuration. The Raman transition allows an indirect transfer of atoms from the internal state $| a\rangle $ to the target state $| b\rangle $ via an excited state $| e\rangle $, that would be otherwise dipole-forbidden. This setup enables us to imprint three-dimensional knotted vortex lines embedded in the probe field to the density in the target state. We elaborate on experimental feasibility as well as on subsequent dynamics of the matter wave.

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Publisher statement:Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Date accepted:11 May 2016
Date deposited:16 June 2016
Date of first online publication:13 June 2016
Date first made open access:16 June 2016

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