Speaker: Dr Angela White
Affiliation: University of Queensland


The demonstration of Bose-Einstein condensates confined to a thin hollow shell in the microgravity environment of the Cold Atomic Laboratory on the International Space Station has opened up the exploration of this intriguing simply connected topology. The closed curved surface of a bubble condensate imposes additional restrictions on superfluid dynamics arising from the continuous nature of the condensate phase. Under an external rotation, the minimum energy configuration consists of vortex pairs, with the second vortex rotating with opposite circulation and aligned at the antipode of the condensate shell. We investigate the response of three-dimensional spherical-shell condensates to rotation and show that at low rotation rates, two aligned triangular Abrikosov-like vortex lattices are formed on each hemispherical surface. As the rotation rate is increased, we see a transition to a multi-charge vortex anti-vortex pair at each pole, surrounded by singly charged vortices in the bulk density. At larger rotation rates, a deformation in the spherical shell shape due to the centrifugal barrier is also observed.


About Australia - New Zealand Cold Atom Seminars

This new initiative hosts a seminar once a month for the Australia – New Zealand cold atom research community.  The purpose is to encourage and facilitate ongoing discussions and collaboration in the local community.  Talks should be less than 40 minutes in length to allow ample time for questions and discussion.

Seminars will be held on the last Friday of the month (except for December) at 1pm Melbourne time (which is normally 3pm New Zealand time).  While the primary format is online via Zoom, various institutions will host the seminar in local seminar rooms.  The Zoom link is https://uqz.zoom.us/j/88604569495

You can sign up for announcements for the seminars at this webpage:

Seminars are recorded, and past seminars can be accessed from this web page.

Contact Matthew Davis mdavis@physics.uq.edu.au for further information.



via Zoom: