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Interaction of ballistic quasiparticles and vortex configurations in superfluid ³He-B

Lookup NU author(s): Professor Carlo Barenghi, Emeritus Professor Yuri Sergeev, Dr Nugzar Suramlishvili, Dr Peter Van Dijk

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Abstract

The vortex line density of turbulent superfluid 3He-B at very low temperature is deduced by detecting the shadow of ballistic quasiparticles, which are Andreev reflected by quantized vortices. Until now the measured total shadow has been interpreted as the sum of shadows arising from interactions of a single quasiparticle with a single vortex. By integrating numerically the quasiclassical Hamiltonian equations of motion of ballistic quasiparticles in the presence of nontrivial but relatively simple vortex systems (such as vortex-vortex and vortex-antivortex pairs and small clusters of vortices), we show that partial screening can take place, and the total shadow is not necessarily the sum of the shadows. We have also found that it is possible that, upon impinging on complex vortex configurations, quasiparticles experience multiple reflections, which can be classical, Andreev, or both.

Publication metadata

Author(s): Barenghi CF, Sergeev YA, Suramlishvili N, van Dijk PJ

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2009

Volume: 79

Issue: 2

Date deposited: 20/11/2013

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: The American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevB.79.024508

DOI: 10.1103/PhysRevB.79.024508

Notes: Article number 024508 11 pages

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