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arXiv 2608.29343cond-mat.soft

双轴液晶中的“超弱”一级相变

"Ultra-weak" First-Order Phase Transition in Biaxial Liquid Crystals

  • Lady Brabourne College(莱迪布拉伯恩学院)
  • Ramsaday College(拉姆萨代学院)
  • Jadavpur University(贾达普大学)

机构由 AI 辅助整理,请以论文原文为准。

Soumyajit Pramanick, Mrinal Kanti Debnath, Nababrata Ghoshal, Soumen Kumar Roy, Sudeshna Dasgupta

AI总结:

本研究通过大晶格多重直方图重加权的高分辨率蒙特卡洛模拟,发现双轴液晶中三临界点与三相点间的单轴-双轴相变是邻近驱动的超弱一级相变,强度比对称性强制的各向同性-单轴一级相变小一个数量级以上,为相关研究提供新方向。

AI中文摘要:

我们报告了高分辨率蒙特卡洛模拟证据,用以表征双轴向列相分子中相变强度的层级关系。通过在大尺寸晶格上采用多重直方图重加权技术,我们证明:尽管各向同性到单轴($I \to N_U$)相变是对称性强制的一级相变,但在三临界点与三相点之间的区域($λ=0.26$),单轴到双轴($N_U \to N_B$)的相变是邻近效应驱动的,且对于大系统尺寸,其强度要小一个数量级以上。这类超弱一级相变可能为未来研究提供新的途径。

英文摘要:

We report high-resolution Monte Carlo evidence characterizing the hierarchy of transition strengths in biaxial nematogens. By employing multiple histogram reweighting on large lattices, we demonstrate that while the isotropic-to-uniaxial ($I \to N_U$) transition is symmetry-enforced first-order, the uniaxial-to-biaxial ($N_U \to N_B$) transition in the region between the tricritical point and the triple point ($λ= 0.26$) is proximity-driven and more than an order of magnitude smaller for large system sizes. Such a class of ultra-weak first-order transitions could be a new pathway for future investigations.

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