Structural and dynamical heterogeneities in two-dimensional melting
Structural and dynamical heterogeneities in two-dimensional melting
复制标题
DOI：
10.1209/0295-5075/86/66004
复制
发表时间：
2008-08
期刊：
影响因子：
--
通讯作者：
H. Shiba;Akira Onuki;Takeaki Araki
中科院分区：
文献类型：
--
作者：
H. Shiba;Akira Onuki;Takeaki Araki
利用分子动力学模拟，我们研究了具有36000个粒子的二维单组分系统在熔化时的结构和动力学不均匀性。在晶体和液体之间，我们发现中间六角态，在那里的密度波动增强在小波数k以及那些六重取向序参数。它们的结构因子都增长到最小波数等于逆系统长度。在六角相中，密度S（k，t）的中间散射函数在小k时以指数衰减率Γk <$kz（z <$2.6）松弛.
Using molecular-dynamics simulation, we study structural and dynamical heterogeneities at melting in two-dimensional one-component systems with 36000 particles. Between crystal and liquid we find intermediate hexatic states, where the density fluctuations are enhanced at small wave number k as well as those of the sixfold orientational order parameter. Their structure factors both grow up to the smallest wave number equal to the inverse system length. The intermediate scattering function of the density S(k, t) is found to relax exponentially with decay rate Γk∝kz with z∼2.6 at small k in the hexatic phase.