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Phase order in superfluid helium films
UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AJ, England.;UCL, Dept Phys & Astron, London WC1H 0AJ, England..
UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AJ, England.;UCL, Dept Phys & Astron, London WC1H 0AJ, England.;Univ Lyon, Lab Phys, Ecole Normale Super Lyon, F-69364 Lyon 07, France..
Univ Lyon, Lab Phys, Ecole Normale Super Lyon, F-69364 Lyon 07, France..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
2015 (engelsk)Inngår i: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 112, nr 5, artikkel-id 56003Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

Classic experimental data on helium films are transformed to estimate a finite-size phase order parameter that measures the thermal degradation of the condensate fraction in the two-dimensional superfluid. The order parameter is found to evolve thermally with the exponent beta = 3 pi(2)/128, a characteristic, in analogous magnetic systems, of the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Universal scaling near the BKT fixed point generates a collapse of experimental data on helium and ferromagnetic films, and implies new experiments and theoretical protocols to explore the phase order. These results give a striking example of experimental finite-size scaling in a critical system that is broadly relevant to two-dimensional Bose fluids. This paper is dedicated to the memory of our friend and colleague Maxime Clusel, with whom we enjoyed many stimulating discussions on related topics.

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2015. Vol. 112, nr 5, artikkel-id 56003
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URN: urn:nbn:se:uu:diva-280114DOI: 10.1209/0295-5075/112/56003ISI: 000369081100018OAI: oai:DiVA.org:uu-280114DiVA, id: diva2:910105
Tilgjengelig fra: 2016-03-08 Laget: 2016-03-08 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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