Nanocapacitor Band Diagram: WKB Tunneling Leakage

This is the 2D companion to the 3D nanocapacitor model: instead of a rendered metal–insulator–metal plate stack, it draws the electron energy-band cross-section along the tunneling axis and, beneath it, the live capacitance-vs-leakage design-space curve. Pick a dielectric — from ordinary SiO₂ to the high-κ oxides (HfO₂, ZrO₂, TiO₂) that replaced it in modern DRAM and logic gate stacks — and watch the WKB tunneling wavefunction visibly decay through the barrier while capacitance density, equivalent oxide thickness, and leakage current all update from the identical model.