铁电性
电容
电容器
材料科学
铁电电容器
负阻抗变换器
电压
光电子学
凝聚态物理
电气工程
物理
电介质
电压源
工程类
电极
量子力学
作者
Asif Islam Khan,Korok Chatterjee,Brian Wang,Steven Drapcho,Long You,Claudy Rayan Serrao,Saidur Rahman Bakaul,R. Ramesh,Sayeef Salahuddin
出处
期刊:Nature Materials
[Springer Nature]
日期:2014-12-15
卷期号:14 (2): 182-186
被引量:671
摘要
The Boltzmann distribution of electrons poses a fundamental barrier to lowering energy dissipation in conventional electronics, often termed as Boltzmann Tyranny. Negative capacitance in ferroelectric materials, which stems from the stored energy of a phase transition, could provide a solution, but a direct measurement of negative capacitance has so far been elusive. Here, we report the observation of negative capacitance in a thin, epitaxial ferroelectric film. When a voltage pulse is applied, the voltage across the ferroelectric capacitor is found to be decreasing with time--in exactly the opposite direction to which voltage for a regular capacitor should change. Analysis of this 'inductance'-like behaviour from a capacitor presents an unprecedented insight into the intrinsic energy profile of the ferroelectric material and could pave the way for completely new applications.
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