Vortices in Superfluids

Our group uses superfluids of light and superfluids formed of ultracold atoms to address fundamental physics questions such as the mechanisms underlying turbulence, and cooperative behaviour in many-body quantum systems, and relies on bridging experimental techniques from the atomic physics, nonlinear optics and imaging communities.

What are the mechanisms underlying turbulent fluid flow? How do these flows facilitate transport of energy and materials?

Turbulent flows, such as the disordered, chaotic tangle of eddies and whirlpools generated as water rushes past a boulder, are ubiquitous in nature. Turbulent mixing, e.g. in ocean flows, plays an important role in the transfer of energy, materials, and organisms. Despite their familiarity, turbulent flows are among the most challenging scientific subjects to understand theoretically, and the underlying mechanisms that generate turbulence and dictate its properties remain largely unknown. The unique properties of superfluid mixtures can be used to reduce turbulent flow to its component parts, allowing us to studying how quantum eddies and whirlpools interact to transfer energy throughout the turbulent fluid.

What are the mechanisms underlying the emergence of cooperative behaviour from a system of many interacting quantum particles, and how does this cooperative behaviour change when the system is driven out of equilibrium?

Society relies on man-made materials, from the electronic components in our phones to the synthetic fibres we use to keep warm. A new class of quantum materials promises to harness the bizarre properties of quantum mechanics to radically change the way we process information and transmit power. In these quantum materials, properties such as superfluidity (fluid flow without viscosity) or superconductivity (conduction of electricity without resistance), emerge as a result of cooperative behaviour of the microscopic particles that make up the materials. The mechanisms behind this cooperative behaviour are elusive, and difficult to understand from first principles. Novel quantum materials, such as quantum droplets formed in a mixture of two-species of ultracold atoms, can help us to study experimentally how quantum particles interact cooperatively to produce macroscopic properties. This allows us to isolate the role of quantum effects such as fluctuations and entanglement in macroscopic emergent phenomena.

We have an open postdoc position. See advert here for details. Please contact us if you are interested.

Resources:

UK Quantum Fluids Webinar Series. Recordings of past webinars can be found on our YouTube channel.

Latest News

New team member
Lou Pickering has joined the team for the summer, with an EPSRC Summer Research Internship. Lou is working on designing optical potentials to controllably nucleate vortex rings in a dilute-gas superfluid. Welcome Lou!
New team member
DAMOP
June 2025 The group had a great visit to Portland in the US for DAMOP2025. DAMOP continues to be one of Kali’s favourite physics conferences, and Omar rocked his first conference talk. Kali then traveled to Seattle for a targeted workshop on compressible turbulence hosted by the Institute for Nuclear Theory at the University of Washington.
DAMOP
We are hiring!
June 2025: Interested in joining the Quantum Fluids research team? We are hiring a PDRA to work on the K-Rb quantum-mixture experiment currently under development. The Royal Society funded research project will explore the role that vortices, topologically-protected defects, play in both supporting and destroying emergent quantum phenomena, such as superfluidity and superconductivity. See https://bit.ly/PDRAQuantumMixtures or contact Dr Kali Wilson for more details.
Vacuum Chamber
Our vacuum chamber build is underway. The chamber will have a dual-species oven loading a 2D MOT, 3D MOT chamber, and dedicated octagonal science cell.
Vacuum Chamber
We are hiring!
August 2024: Interested in joining the Quantum Fluids research team? We are hiring a PDRA to work on the K-Rb quantum-mixture experiment currently under development. The experiment will ultimately be used to explore vortex dynamics in binary superfluids. See https://bit.ly/QuantumMixturesPDRA or contact Dr Kali Wilson for more details.

Team

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Dr Kali Wilson

Proleptic Senior Lecturer
Royal Society University Research Fellow

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Omar Moutamani

PhD student

Recent publications