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arXiv 1903.05049cond-mat.soft
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通过二维结构变换的弹性模量的演变

Evolution of elastic moduli through a two-dimensional structural transformation

Alejandro Pacheco-Sanjuan, Tyler B. Bishop, Erin E. Farmer, Pradeep Kumar, Salvador Barraza-Lopez

摘要:

我们使用一个经典的分析和可分离的弹性能量景观描述SnO单层估计软化的弹性模量通过在有限的温度下发生在这种材料的机械不稳定性。尽管由于其导致量子准弹性相的低能量势垒$J$而不严格适用于这种材料,但本练习是相关的,因为它建立了一个概念性程序来直接从二维弹性能量景观估计这种模量。作为额外的支持存在的量子准弹性阶段,我们进行了定性的WKB分析,估计逃逸时间从一个单独的好的景观;逃逸时间的障碍$J$的高度呈指数增加。我们还提供了反对额外的变换到一个平面晶格,由于其高能量成本的参数。这些结果继续为二维材料中软物质概念的有用性以及量子效应潜在潜伏在软物质中提供了案例。

英文摘要:

We use a classical analytical and separable elastic energy landscape describing SnO monolayers to estimate the softening of elastic moduli through a mechanical instability occurring at finite temperature in this material. Although not strictly applicable to this material due to its low energy barrier $J$ that leads to a quantum paraelastic phase, the present exercise is relevant as it establishes a conceptual procedure to estimate such moduli straight from a two-dimensional elastic energy landscape. As additional support for the existence of a quantum paraelastic phase, we carry a qualitative WKB analysis to estimate escape times from an individual well on the landscape; escape times increase exponentially with the height of the barrier $J$. We also provide arguments against an additional transformation onto a planar lattice due to its high energy cost. These results continue to establish a case for the usefulness of soft matter concepts in two-dimensional materials, and of the potential lurking of quantum effects into soft matter.

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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