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arXiv 1011.2863cond-mat.dis-nn
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非晶态固体的Leggett界

Leggett's bound for amorphous solids

Giulio Biroli, Bryan Clark, Laura Foini, Francesco Zamponi

摘要:

我们研究了由Leggett导出的上界对非晶态固体超流分数的限制。为了实现这一点,我们使用作为输入的密度分布产生的非晶态固体在各种不同的方式,包括通过调查高斯波动周围的经典结果。这些粗略的估计表明,至少在上限的水平上,玻璃和具有相同林德曼比的晶体之间的超流性没有太大的差异。此外,我们进行路径积分蒙特卡罗模拟的可区分氦4迅速淬火从液相到非常低的温度,在密度的冻结过渡。我们发现,该系统结晶非常迅速,没有任何迹象的中间玻璃。总的来说,我们的研究结果表明,实验观察到的大超流馏分氦4快速淬火后,对应的样品发展远离平衡,而不是在一个稳定的玻璃相。其他方案和比较其他结果的超级玻璃相进行了讨论。

英文摘要:

We investigate the constraints on the superfluid fraction of an amorphous solid following from an upper bound derived by Leggett. In order to accomplish this, we use as input density profiles generated for amorphous solids in a variety of different manners including by investigating Gaussian fluctuations around classical results. These rough estimates suggest that, at least at the level of the upper bound, there is not much difference in terms of superfluidity between a glass and a crystal characterized by the same Lindemann ratio. Moreover, we perform Path Integral Monte Carlo simulations of distinguishable Helium 4 rapidly quenched from the liquid phase to very lower temperature, at the density of the freezing transition. We find that the system crystallizes very quickly, without any sign of intermediate glassiness. Overall our results suggest that the experimental observations of large superfluid fractions in Helium 4 after a rapid quench correspond to samples evolving far from equilibrium, instead of being in a stable glass phase. Other scenarios and comparisons to other results on the super-glass phase are also discussed.

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