Evidence for a Disordered Critical Point in a Glass-Forming Liquid.
Evidence for a Disordered Critical Point in a Glass-Forming Liquid.
复制标题
DOI：
10.1103/physrevlett.114.205701
复制
发表时间：
2015-03
影响因子：
8.6
通讯作者：
L. Berthier;R. Jack
中科院分区：
文献类型：
--
作者：
L. Berthier;R. Jack
利用计算机模拟的原子玻璃形成液体，我们调查的流体配置和淬火参考系统之间的重叠的波动。我们发现，随着温度的降低，重叠发展的大波动，与有效场论预测的随机临界点的存在相一致。我们讨论了假定的临界点附近的波动标度，比较观察到的行为与随机场伊辛模型。我们认为，这一临界点直接揭示了存在的非晶亚稳态之间的界面张力，一个数量相关的平衡松弛和非平衡熔化的稳定的玻璃配置。
Using computer simulations of an atomistic glass-forming liquid, we investigate the fluctuations of the overlap between a fluid configuration and a quenched reference system. We find that large fluctuations of the overlap develop as temperature decreases, consistent with the existence of the random critical point that is predicted by effective field theories. We discuss the scaling of fluctuations near the presumed critical point, comparing the observed behavior with that of the random-field Ising model. We argue that this critical point directly reveals the existence of an interfacial tension between amorphous metastable states, a quantity relevant both for equilibrium relaxation and for nonequilibrium melting of stable glass configurations.