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Superfluid density of ~4He confined in nanopores

机译:〜4He的超流体密度局限于纳米孔中

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摘要

Helicity modulus in one-dimensional (1D) and anisotropic two-dimensional (2D) classical XY models is calculated. In finite-size 1D lattice, it is unity at absolute zero and rapidly vanishes as temperature increases due to proliferating phase slippage. Similarly, in anisotropic 2D lattice with large aspect ratio, helicity modulus in the direction of the longer side diminishes at a temperature much smaller than Kosterlitz-Thouless transition temperature Tkt. This finding is in contrast to the recent observation of finite superfluid density below Tkt in ~4He films adsorbed on 1D nanopores. We argue that the superfluid density observed in the experiment is not affected by phase slippage and that is the reason why finite superfluid density was observed. Furthermore, we discuss the observability of genuine 1D behavior of superfluid density in 1D nanopores.
机译:计算一维(1D)和各向异性二维(2D)经典XY模型中的螺旋模量。在有限尺寸的一维晶格中,它在绝对值为零时是统一的,并且由于相移的激增而随温度升高而迅速消失。类似地,在具有长宽比大的各向异性2D晶格中,长边方向上的螺旋模量在比Kosterlitz-Thouless转变温度Tkt小得多的温度下减小。这一发现与最近在1D纳米孔上吸附的〜4He薄膜中Tkt以下的有限超流体密度的观察结果相反。我们认为,在实验中观察到的超流体密度不受相滑移的影响,这就是为什么观察到有限的超流体密度的原因。此外,我们讨论了在1D纳米孔中超流体密度真正1D行为的可观察性。

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  • 来源
    《Physical review》 |2009年第4期|658-663|共6页
  • 作者

    K. Yamashita; D. S. Hirashima;

  • 作者单位

    Department of Physics, Nagoya University, Nagoya 464-8602, Japan;

    Department of Physics, Nagoya University, Nagoya 464-8602, Japan;

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  • 正文语种 eng
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