发表机构
ENS de Lyon, CNRS, LPENSL, UMR5672(里昂高等师范学院,法国国家科学研究中心,理论物理实验室)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文提出一个带空位的钟模型作为二维熔化的最小晶格模型,通过多种数值方法研究相图,揭示了从KTHNY连续熔化到一级相变的交叉,并通过三临界点统一了不同熔化场景。
AI 中文摘要
我们引入了一个二维熔化的晶格最小模型,这是一个带空位的钟模型,其控制参数为温度、化学势和外场。我们使用簇蒙特卡洛、张量网络重整化群和自洽平均场方法研究了完整的相图。观察到非普适的熔化场景集合,包括KTHNY场景,即两次Berezinskii-Kosterlitz-Thouless相变界定了一个准长程有序相。上相变演变为一级相变,与硬盘和软盘模拟类似,并且在低化学势下,有序高密度相与无序低密度相之间存在单一相变。这种演变通过一个特殊的三临界点发生,我们对此进行了详细研究。因此,这项工作为理解二维熔化场景之间的交叉提供了框架,并为真实系统的行为提供了见解。
英文摘要
We introduce an on-lattice minimal model of two-dimensional melting, a clock model with vacancies with control parameters temperature, chemical potential and external field. We study the full phase diagram using cluster Monte Carlo, Tensor Network Renormalisation Group and selfconsistent mean field methods. A non-universal ensemble of melting scenarios is observed including the KTHNY scenario of two Berezinskii-Kosterlitz-Thouless phase transitions delimiting a quasilong-range ordered phase. The upper transition evolves into first-order transition in analogy with simulations on hard and soft discs and at low chemical potential there is a single transition between ordered high density and disordered low density phases. The evolution is via a special tricritical point that is accessed in detail. This work therefore provides a framework for understanding the crossover between 2D melting scenarios and offers insights into the behavior of realistic systems.