International Conference on
Quantum Fluids and Solids 2016

10th – 16th August 2016
Clarion Congress Hotel, Prague, Czech Republic

13:00 – 16:30, Wednesday 10th August 2016,

Lecture Theatre T1, Building ‘T’
Univerzita Karlova v Praze - Matematicko-Fyzikální fakulta, Areál Troja
V Holešovičkách 747/2,
180 00 Praha 8

Before the conference welcome reception, a series of tutorials will take place at the Troja campus of the Faculty of Mathematics and Physics on Wednesday 10thAugust from 13:00. Free to all registered QFS participants, these tutorials will be given by preeminent members of the low temperature physics community and will cover the basics of QFS Topics

If you wish to attend these tutorials, please take their timing into account when making travel arrangements. No formal registration is required.

Programme:

13:00   Cryogenic Techniques and Low Temperature Properties of Matter
            Christian Enns, Heidelberg University, Germany
 

13:45   Bose Condensation and Superfluidity in Liquid 4He
            William Vinen, University of Birmingham, UK

14:45   “Pure” Superfluid 3He, an introduction
            George Pickett, University of Lancaster, UK

15:30   The Supersolid Story
             Moses Chan, Penn State University, USA

Abstracts

Author Title Abstract
Moses Chan
Penn State University, USA
The Supersolid Story  Torsional oscillator (TO) measurements of solid 4He carried out twelve years ago found an abrupt drop in the resonant period (∆P) below 0.2K, suggesting superfluid onset in the solid. However, subsequent studies indicate the ∆P is due to the stiffening of the solid. New TO studies free of stiffening effect placed an upper limit of superfluidity in solid of 5 x10-6. Interestingly this is not the last word in supersolidity. By means of a clever design, Hallock found evidence of superfluid-like mass flow through solid 4He sandwiched between two superfluid reservoirs. Recent experiments at UMass, Alberta and Penn State on the nature of this mass flow will be discussed. 
Christian Enns
Heidelberg University, Germany
Cryogenic techniques and low temperature properties of matter The most common method for producing temperatures well below one Kelvin is the 3He/4He dilution refrigerator. If equipped with a well-designed nuclear demagnetization stage such systems can reach temperatures in the low microkelvin range. We will discuss some basic aspects of these cooling techniques and will point out recent developments. In addition, methods to measure very low temperatures are presented, again with an emphasis on new techniques. Since the first liquefaction of helium many fascinating properties of matter at low temperatures have been discovered. A brief overview will be given, while highlighting a few specific examples.
George Pickett
Lancaster University, UK
“Pure” superfluid 3He, an introduction  At millikelvin temperatures the Fermionic 3He atoms in liquid 3He form Cooper pairs to create superfluid 3He. The Cooper pair has an angular moment of ħ, with the two component atoms orbiting each other as a loosely-connected dimer.  Since the angular momentum is odd, to preserve parity, the spin must also be odd, i.e. also ħ.  This gives the Cooper pairs a very rich structure allowing the existence of several phases with very different properties, and providing a number of handles for probing the condensate, especially by NMR and quasiparticle “optics”. In the very low temperature region, where the condensate is essentially “pure”, the wavefunction symmetry mimics that of the metric of the Universe, allowing “tabletop” cosmological experiments.
William Vinen
University of Birmingham, UK
Bose condensation and superfluidity in liquid 4He A description of the superfluid properties of liquid 4He at temperatures below the lambda-transition (metastable frictionless flow, two-fluid effects, and the quantization of superfluid circulation)  will be followed by an account of the way in which Bose condensation in a system of interacting particles can lead to such properties.   
 

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Organised by:
Faculty of Mathematics and Physics, Charles University in Prague
Institute of Physics, Czech Academy of Science

Sponsored by:
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