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    Dynamics of Fine Particles Due to Quantized Vortices on the Surface of Superfluid He-4
    (2019-07-01)
    Inui, Sosuke
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    Tsubota, Makoto
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    Moroshkin, Peter
    ;
    Leiderer, Paul
    ;
    Kono, Kimitoshi
    We have conducted calculations of the coupled dynamics of quantized vortices and fine metallic particles trapped at a free surface of superfluid 4He. The computational result so far indicates that a particle-vortex complex may produce quasi-periodic motions along the surface and that the motions can be enhanced if the metallic particles are heated and induce local radial flows. Our results qualitatively reproduce recent experimental observations of trapped particle motion.
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    Instability of a spontaneously formed multiple-flux vortex in polariton condensates
    (2015-07-01)
    Chen, Ting-Wei
    ;
    Cheng, Szu-Cheng
    ;
    Hsieh, Wen-Feng
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    光電工程學系
    ;
    Department of Photonics
    A spontaneously formed vortex can occur in an incoherently pumped microcavity-polariton condensate which is a non-equilibrium system. The stability of this vortex depends on the flux quanta that the vortex owns. In this paper, we have investigated the dynamics of spontaneously formed vortices with multiple-flux quanta in incoherently pumped microcavity-polariton condensates. From the excitation spectra of a spontaneously formed vortex, we can study the stability of the vortex under different pump strength. The vortices with flux quanta less than four are dynamically stable within a wide range of pump strength. However, when the flux quanta of a vortex is greater than three and the pump power is above a critical pump strength, some imaginary parts of excitation modes of the vortex become positive. The vortex then becomes dynamically unstable and Lends to split into several vortices with smaller flux quanta. (C) 2015 Elsevier Ltd. All rights reserved.