Increasing the density melts ultrasoft colloidal glasses.
Increasing the density melts ultrasoft colloidal glasses.
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DOI：
10.1103/physreve.82.060501
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
L. Berthier;A. Moreno;G. Szamel
中科院分区：
文献类型：
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作者：
L. Berthier;A. Moreno;G. Szamel
我们用理论和模拟研究了超软胶体中无定形玻璃态的存在。我们将超网链近似与模耦合理论相结合，研究了软排斥球与赫兹势相互作用的动力学相图，重点研究了低温、大密度情况下的动力学相图。在恒温下，我们发现在压缩时进入无定形玻璃态，就像胶体硬球一样，但当密度进一步增加时，玻璃出人意料地融化。我们将这种重入流体-玻璃转变归因于粒子的柔软性，并将这种行为与先前报道的软系统中的反常现象相关联，从而强调了它的普遍性。对预测的流体-玻璃-流体序列进行了数值验证。
We use theory and simulations to investigate the existence of amorphous glassy states in ultrasoft colloids. We combine the hypernetted chain approximation with mode-coupling theory to study the dynamic phase diagram of soft repulsive spheres interacting with a Hertzian potential, focusing on low temperatures and large densities. At constant temperature, we find that an amorphous glassy state is entered upon compression, as in colloidal hard spheres, but the glass unexpectedly melts when density increases further. We attribute this reentrant fluid-glass transition to particle softness and correlate this behavior to previously reported anomalies in soft systems, thus emphasizing its generality. The predicted fluid-glass-fluid sequence is confirmed numerically.