  The pressing quest for overcoming Boltzmann tyranny in low-power nanoscale
electronics revived the thoughts of engineers of early 1930-s on the
possibility of negative circuit constants. The concept of the
ferroelectric-based negative capacitance (NC) devices triggered explosive
activity in the field. However, most of the research addressed transient NC,
leaving the basic question of the existence of the steady-state NC unresolved.
Here we demonstrate that the ferroelectric nanodot capacitor hosts a stable
two-domain state realizing the static reversible NC device thus opening routes
for the extensive use of the NC in domain wall-based nanoelectronics.
