Coercive fields of piezoelectric materials can be strongly influenced by environmental temperature. We investigate this influence using a heterostructure consisting of a single crystal piezoelectric film and a quantum dots containing membrane. Applying electric field leads to a physical deformation of the piezoelectric film, thereby inducing strain in the quantum dots and thus modifying their optical properties. The wavelength of the quantum dot emission shows butterfly-like loops, from which the coercive fields are directly derived. The results suggest that coercive fields at cryogenic temperatures are strongly increased, yielding values several tens of times larger than those at room temperature. We adapt a theoretical model to fit the measured data with very high agreement. Our work provides an efficient framework for predicting the properties of ferroelectric materials and advocating their practical applications, especially at low temperatures.

中文翻译：

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量子点应变片测量的温度相关矫顽场

压电材料的矫顽场会受到环境温度的强烈影响。我们使用由单晶压电膜和包含量子点的膜组成的异质结构研究这种影响。施加电场导致压电膜的物理变形，从而在量子点中引起应变，从而改变了它们的光学性质。量子点发射的波长显示出蝴蝶状的环，从中可以直接导出矫顽场。结果表明，低温下的矫顽场会大大增加，其值比室温下的矫顽场大几十倍。我们采用理论模型以非常高的一致性拟合测量数据。