Professor Christopher Foot: Publications

Centralized design and production of the ultra-high vacuum and laser-stabilization systems for the AION ultra-cold strontium laboratories

AVS Quantum Science American Vacuum Society 6:1 (2024) 14409

Authors:

B Stray, O Ennis, S Hedges, S Dey, M Langlois, K Bongs, S Lellouch, M Holynski, B Bostwick, J Chen, Z Eyler, V Gibson, Tl Harte, Cc Hsu, M Karzazi, J Mitchell, N Mouelle, U Schneider, Y Tang, K Tkalcec, Y Zhi, K Clarke, A Vick, K Bridges, J Coleman, G Elertas, L Hawkins, S Hindley, K Hussain, C Metelko, H Throssell, Cfa Baynham, O Buchmüller, D Evans, R Hobson, L Iannizzotto-Venezze, A Josset, E Pasatembou, Be Sauer, Mr Tarbutt, L Badurina, A Beniwal, D Blas, J Carlton, J Ellis, C McCabe, E Bentine, M Booth, D Bortoletto, C Foot

Abstract:

This paper outlines the centralized design and production of the ultra-high-vacuum sidearm and laser-stabilization systems for the AION Ultra-Cold Strontium Laboratories. Commissioning data on the residual gas and steady-state pressures in the sidearm chambers, on magnetic field quality, on laser stabilization, and on the loading rate for the 3D magneto-optical trap are presented. Streamlining the design and production of the sidearm and laser stabilization systems enabled the AION Collaboration to build and equip in parallel five state-of-the-art Ultra-Cold Strontium Laboratories within 24 months by leveraging key expertise in the collaboration. This approach could serve as a model for the development and construction of other cold atom experiments, such as atomic clock experiments and neutral atom quantum computing systems, by establishing dedicated design and production units at national laboratories.

Universal scaling of the dynamic BKT transition in quenched 2D Bose gases

Science American Association for the Advancement of Science 382:6669 (2023) 443-447

Authors:

Shinichi Sunami, Vijay Singh, David Garrick, Abel Beregi, Adam Barker, Kathrin Luksch, Elliot Bentine, Ludwig Mathey, Christopher Foot

Progress Towards a Compact Cold-Atom Microwave Clock

Institute of Electrical and Electronics Engineers (IEEE) 00 (2023) 1-3

Authors:

Martin Knapp, Sam Walby, Mohsin Haji, Chris Foot, Patrick Gill

Universal Scaling of the Dynamic BKT Transition in Quenched 2D Bose Gases

(2022)

Authors:

Shinichi Sunami, Vijay P Singh, David Garrick, Abel Beregi, Adam J Barker, Kathrin Luksch, Elliot Bentine, Ludwig Mathey, Christopher J Foot

Observation of the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional Bose gas via matter-wave interferometry

Physical Review Letters American Physical Society 128:25 (2022) 250402

Authors:

S Sunami, Vp Singh, D Garrick, A Beregi, Aj Barker, K Luksch, E Bentine, L Mathey, Cj Foot

Abstract:

We probe local phase fluctuations of trapped two-dimensional (2D) Bose gases using matter-wave interferometry. This enables us to measure the phase correlation function, which changes from an algebraic to an exponential decay when the system crosses the Berezinskii-Kosterlitz-Thouless (BKT) transition. We determine the temperature dependence of the BKT exponent η and find the critical value ηc = 0.17(3) for our trapped system. Furthermore, we measure the local vortex density as a function of the local phase-space density, which shows a scale-invariant behaviour across the transition. Our experimental investigation is supported by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.

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