标题： 液晶中极性序与位置序的相互作用 —— 重返铁电向列相的观察 显示英文标题

标题： Interplay of polar order and positional order in liquid crystals -- observation of re-entrant ferroelectric nematic phase

摘要： 我们证明，极性有序的发展可能会自发破坏液晶的层状结构。 这导致了一个不寻常的相序列，铁电向列相出现在非极性层状相之下。 这种现象与层状层内的不利偶极子相互作用有关，并可以通过朗道理论进行解释，在该理论中，温度依赖项是非单调的，因为它受到自发电极化的影响而被重正化。 显示英文摘要

摘要： We show that development of polar order may spontaneously destroy the lamellar structure of a liquid crystal. This results in an unusual sequence of phases with the ferroelectric nematic phase appearing below a non-polar smectic phase. The effect is related to unfavourable dipole interactions within the smectic layers and can be explained by Landau theory in which the temperature dependent term is non-monotonic as it is renormalized by spontaneous electric polarization.