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Atomic and Laser Physics
Credit: Jack Hobhouse

Professor Christopher Foot

Professor of Physics

Research theme

  • Quantum optics & ultra-cold matter

Sub department

  • Atomic and Laser Physics

Research groups

  • Ultracold quantum matter
  • AION/Magis
Christopher.Foot@physics.ox.ac.uk
Telephone: 01865 (2)72256
Clarendon Laboratory, room 161
  • About
  • Publications

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

(2021)

Authors:

Sebastian Leontica, Christopher Foot
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