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arXiv 1812.02007cond-mat.soft
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随机钉扎对二维软磁盘系统熔化的影响

The influence of random pinning on the melting scenario of two-dimensional soft-disk systems

E. A. Gaiduk, Yu. D. Fomin, E. N. Tsiok, V. N. Ryzhov

摘要:

利用计算机模拟研究了二维软磁盘系统在有无随机钉扎作用下的熔化情况,通过对状态方程、取向和平移序参量的关联函数、杨氏模量和重整化群方程的分析,确定了熔化参数.从这些标准得到的转变点是在良好的协议。研究表明,该体系的熔化分为两个阶段:一级六方相到液相的转变和Berezinskiii-Kosterlitz-无晶型六方相变。随机钉扎扩大了六角相,但没有改变熔化的情况。

英文摘要:

We present the results of a computer simulation study of the melting scenario of two-dimensional soft-disk systems with potential $U(r)=\varepsilon(σ/r)^n$, $n=12$ and $n=1024$, both in the presence of random pinning and without it. The melting parameters have been determined from analysis of the behavior of equations of state, correlation functions of the orientational and translational order parameters, Young modulus and renormalization group equations. The transition points obtained from these criteria are in good agreement. We have shown that the systems melted in two stages - first-order hexatic phase to liquid transition and the continuous Berezinskii-Kosterlitz-Thouless type crystal-hexatic phase transition. Random pinning widened the hexatic phase, but left the melting scenario unchanged.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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