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Transient negative differential capacitance, the dynamic reversal of transient capacitance in an electrical circuit, is of highly technological and scientific interest since it probes the foundation of ferroelectricity. We study a resistor-ferroelectric capacitor (R-FEC) network through a series of coupled equations based on Kirchhoff’s law, electrostatics, and Landau theory. We show that transient negative capacitance (NC) in a R-FEC circuit originates from the mismatch in switching rate between the free charge on the metal plate and the bound charge in a ferroelectric (FE) capacitor during the polarization switching. This transient free charge–polarization mismatch is driven by the negative curvature of the FE free-energy landscape, and it is also analytically shown that a free-energy profile with a negative curvature is the only physical system that can describe transient NC in a R-FEC circuit. Furthermore, transient NC …
American Physical Society
Publication date: 
10 Jan 2018

Sou-Chi Chang, Uygar E Avci, Dmitri E Nikonov, Sasikanth Manipatruni, Ian A Young

Biblio References: 
Volume: 9 Issue: 1 Pages: 014010
Physical Review Applied