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Andreev reflection, a tool to investigate vortex dynamics and quantum turbulence in ³He-B

Lookup NU author(s): Emeritus Professor Yuri Sergeev

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Abstract

Andreev reflection of quasiparticle excitations provides a sensitive and passive probe of flow in superfluid ³He-B. It is particularly useful for studying complex flows generated by vortex rings and vortex tangles (quantum turbulence). We describe the reflection process and discuss the results of numerical simulations of Andreev reflection from vortex rings and from quantum turbulence. We present measurements of vortices generated by a vibrating grid resonator at very low temperatures. The Andreev reflection ismeasured using an array of vibrating wire sensors. At low grid velocities, ballistic vortex rings are produced. At higher grid velocities, the rings collide and reconnect to produce quantum turbulence. We discuss spatial correlations of the fluctuating vortex signals measured by the different sensor wires. These reveal detailed information about the formation of quantum turbulence and about the underlying vortex dynamics.

Publication metadata

Author(s): Fisher SN, Jackson MJ, Sergeev YA, Tsepelin V

Publication type: Article

Publication status: Published

Journal: Proceedings of the National Academy of Sciences of the USA

Year: 2014

Volume: 111

Issue: suppl. 1

Pages: 4659-4666

Print publication date: 25/03/2014

Acceptance date: 18/10/2013

Date deposited: 31/03/2014

ISSN (print): 0027-8424

ISSN (electronic): 1091-6490

Publisher: National Academy of Sciences

URL: http://dx.doi.org/10.1073/pnas.1312543110

DOI: 10.1073/pnas.1312543110

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