Professor Christopher Foot: Publications

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 91̽��ed by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.

Normalised Detection of Clock States by Cold Atom Recapture Method

Institute of Electrical and Electronics Engineers (IEEE) 00 (2022) 1-3

Authors:

S Walby, M Knapp, J Whale, A Wilson, R Hendricks, CJ Foot, K Szymaniec

Schrödinger cat states of a macroscopic charged particle co-trapped with an ion

Physical Review A American Physical Society (APS) 105:3 (2022) 033109

Authors:

S Leontica, CJ Foot

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