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arXiv 1202.2987cond-mat.othercond-mat.stat-mech
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~ 3 He-B中量子化涡旋环的Andreev散射截面

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

N. Suramlishvili, A. W. Baggaley, C. F. Barenghi, Y. A. Sergeev

摘要:

数值研究了超流~ 3 He-B中三维孤立量子化涡旋环超低温Andreev散射截面。我们计算了环的大小和入射的热准粒子激发的光束和环的运动方向之间的角度的横截面的依赖关系。我们还介绍了,并研究了数值,横截面平均在所有可能的方向的涡环,这样的横截面可能是特别相关的实验数据的分析。我们还分析了屏蔽效应对涡环系统准粒子Andreev反射的作用。利用孤立环得到的结果,我们发现,非连接环系统的屏蔽因子强烈地依赖于涡环的平均半径,并且屏蔽效应随环尺寸的减小而增大。

英文摘要:

We studied numerically the Andreev scattering cross-sections of three-dimensional isolated quantized vortex rings in superfluid 3He-B at ultra-low 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.

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