Transport and Turbulence in Quasi-Uniform and Versatile Bose-Einstein Condensates

1. Front Matter

   Pages i-xx

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2. Introduction

   • Gauthier Guillaume

   Pages 1-17

3. Theoretical Background

   • Gauthier Guillaume

   Pages 19-54

4. A Versatile BEC Apparatus

   • Gauthier Guillaume

   Pages 55-77

5. Configuring BECs with Digital Micromirror Devices

   • Gauthier Guillaume

   Pages 79-119

6. A Tuneable Atomtronic Oscillator

   • Gauthier Guillaume

   Pages 121-138

7. Creation and Dynamics of Onsager Vortex Clusters

   • Gauthier Guillaume

   Pages 139-169

8. Conclusion

   • Gauthier Guillaume

   Pages 171-173

9. Back Matter

   Pages 175-177

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Advancing the experimental study of superfluids relies on increasingly sophisticated techniques. We develop and demonstrate the loading of Bose-Einstein condensates (BECs) into nearly arbitrary trapping potentials, with a resolution improved by a factor of seven when compared to reported systems. These advanced control techniques have since been adopted by several cold atoms labs around the world.
How this BEC system was used to study 2D superfluid dynamics is described. In particular, negative temperature vortex states in a two-dimensional quantum fluid were observed. These states were first predicted by Lars Onsager 70 years ago and have significance to 2D turbulence in quantum and classical fluids, long-range interacting systems, and defect dynamics in high-energy physics. These experiments have established dilute-gas BECs as the prototypical system for the experimental study of point vortices and their nonequilibrium dynamics. 


We also developed a new approach to superfluid circuitry based on classical acoustic circuits, demonstrating its conceptual and quantitative superiority over previous lumped-element models. This has established foundational principles of superfluid circuitry that will impact the design of future transport experiments and new generation quantum devices, such as atomtronics circuits and superfluid sensors.

• Bose-Einstein Condensate
• Superfluid Transport
• Turbulence in BEC
• Negative Temperature
• Quantum Thermodynamics
• Digital Micromirror Device (DMD)
• Onsager Vortices
• Superfluid Acoustic Model

• School of Mathematics and Physics, The University of Queensland, Brisbane, Australia

  Gauthier Guillaume

Guillaume Gauthier received his B.Eng from McMaster University in 2014 and D.Phil. degree in 2019 from the University of Queensland. He is currently a research academic at in the cold atom group at the University of Queensland where he is continuing his research into trubulence and trasport in superfluid dilute quantum gasses. His major academic acheivements include demonstrating the utility of Digital-Micromirror Devices in quantum dilute gasses. The first experimental realization of negative absolute temperature Onsager vortices, and demonstrating the equivalence between superfluid transport near equilibrium and acoustic transport in classical systems.

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