Spinor condensates in toroidal traps

Using magnetic traps, BECs are only prepared in particular magnetic internal states for which the Zeeman interaction produces a trapping geometry.  However, using optical traps, which are insenstive to the magnetic internal state, one can trap BECs in any internal state, allowing the spin of the atoms to be essentially a free parameter. Spinor condensates, which are multi-component condensates can be created in optical traps, where all magnetic sublevels of an internal state are populated. For our system, which starts in the F=1,mF=-1 state state, a spinor condensate would be populated in the F=1, mF=-1,0,+1. This allows another free parameter to be explored, and the populations of these states can be altered through spin-exchange collisions.

We have recently implemented RF and microwave antennas in our system. By proper application of these fields, we can prepare the condensate in mixtures or superpositions of various internal states through spin flips. This project will quantify and develop the methods, such as Rapid Adiabatic Passage to couple and prepare desired internal state mixtures. This will then be applied this to a condesates in our optically trapped ring geometry, and study the dynamics and superfluid behaviour of spinor condensates in these systems.

ARC Discovery Projects: Spin vortex dynamics in a ferromagnetic superfluid (2020-2023)

Magnetic spin vortices are stable whirlpool-like objects that can spontaneously form when magnetic materials are rapidly cooled. This project aims to understand and manipulate spin vortices in a magnetic quantum fluid, one of the cleanest and most controllable magnetic systems. The significance is that spin vortices are potentially fundamental elements of future electronic technologies for advanced storage and logic. The expected outcomes are the ability to create spin vortices on demand, and the characterisation of their suitability for future applications.

ARC Future Fellowship - Turbulent Cascades in Superfluid Flatland (2020-2024)

This ARC funded Future Fellowship project will determine how vortex dynamics redistribute energy across broad length scales in superfluids, how turbulence arises from instabilities, and how turbulence redistributes energy in multicomponent superfluids. The results will be beneficial to the understanding of the physics of quantum superfluids, and will inform the engineering of quantum-enhanced devices that utilise trapped superfluid media for precision sensing.

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Chief Investigator, Research Fellow
Matthew Davis
Chief Investigator, Professor
Tyler Neely
ARC Future Fellow / Senior Lecturer