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Cross-sections of Andreev scattering by quantized vortex rings in ³He-B

Lookup NU author(s): Dr Nugzar Suramlishvili, Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi, Emeritus Professor Yuri Sergeev

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Abstract

We studied numerically the Andreev scattering cross-sections of three-dimensional isolated quantized vortex rings in superfluid He-3-B at ultralow temperatures. We calculated the dependence of the cross-section on the ring's size and on the angle between the beam of incident thermal quasiparticle excitations and the direction of the ring's motion. We also introduced, and investigated numerically, the cross-section averaged over all possible orientations of the vortex ring; such a cross-section may be particularly relevant for the analysis of experimental data. We also analyzed the role of screening effects for Andreev reflection of quasiparticles by systems of vortex rings. Using the results obtained for isolated rings we found that the screening factor for a system of unlinked rings depends strongly on the average radius of the vortex ring, and that the screening effects increase with decreasing the rings' size.

Publication metadata

Author(s): Suramlishvili N, Baggaley AW, Barenghi CF, Sergeev YA

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2012

Volume: 85

Issue: 17

Print publication date: 25/05/2012

Date deposited: 15/11/2013

ISSN (print): 1098-0121

ISSN (electronic): 1550-235X

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevB.85.174526

DOI: 10.1103/PhysRevB.85.174526

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