Publication Type:Journal Article
Source:Nature Materials, Nature Publishing Group, Volume 14, Number 2, p.182-186 (2015)
Keywords:Boltzmann distribution, Boltzmann equation, Capacitance, Capacitors, Direct measurement, Energy dissipation, Epitaxial ferroelectric films, Ferroelectric capacitors, Ferroelectric devices, Ferroelectric films, Ferroelectric materials, ferroelectricity, Fundamental barriers, Intrinsic energy, negative capacitance, New applications
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. © 2015 Macmillan Publishers Limited. All rights reserved.
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