“Negative Capacitance” reduces power consumption in transistors. New phenomenon could save energy in computer chips A negative capacitance transistor consumes 30 % less energy than conventional devices. A capacitor is a device that stores charge. The amount of charge stored is proportional to the voltage applied across its terminals.

https://medium.com/@vinven7/negative-capacitance-reduces-power-consumption-in-transistors-36f07eb80997