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Professor Shaun Fisher

Formerly at Lancaster University

Shaun Fisher

PhD supervision

Quantum Fluids
Ultra Low Temperature Physics

Research Interests

I am head of the Lancaster Ultra-Low Temperature Group. We research various aspects of quantum fluids and solids. We have advanced microKelvin cooling techniques to study superfluid 3He and related systems in the zero temperature limit. Our group uses 'Lancaster-Style Nuclear cooling cells' to cool electrons in copper to just a few microKelvin and superfluid 3He to temperatures approaching 80 microKelvin. We have built the world's coldest dilution refrigerator as part of our advanced microKelvin cooling machine.

Our research focusses primarily on the exotic properties of superfluid 3He at ultra-low temperatures. Our record-breaking cooling techniques facilitate experiments on superfluid 3He-B in the ballistic quasiparticle regime where the excitation mean free path is effectively infinite (~ km). We have developed ballistic quasiparticle beam techniques on macroscopic (mm) length scales. We have made direct measurements of Andreev Scattering from various superfluid structures. We have studied phase transitions and dynamic properties of the A-B phase boundary at low temperatures, and we used NMR techniqes to discover a new mode of coherent spin precession described as a `magnon BEC'. Recent work has focussed on quantum turbulence in the zero temperature limit. We have built a quasiparticle camera to make real time images of the quantum vortex tangles.

We also use superfluids as analogue systems to study cosmological phenomena such as the Kibble mechanism for cosmic string creation in the early Universe. 

Teaching and Admin

I have taught various undergraduate courses including matter at low temperatures, statistical physics, low temperature mini-projects, physical systems and various experimental projects. I was the director of teaching for undergraduate physics (2005-2010) and I am head of the condensed matter experimental research division (from 2012).


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