Quantum Dot — Coulomb Blockade

Single-electron tunneling · Addition spectrum · Stability diagram

Charging energy Ec (meV)2.0

Level spacing Δ (meV)0.50

Temperature kT (meV)0.05

Tunnel rate Γ (meV)0.08

Dot levels N8

Left: Coulomb oscillations (conductance peaks). Right: Stability diamonds (Vsd vs Vg). Click left plot to highlight.

Coulomb blockade: tunneling through a quantum dot is suppressed unless the gate voltage aligns a charge state degeneracy. Addition energy = Ec + Δ (with level spacing Δ from quantum confinement). Diamond edges follow slopes ±Cg/(C+Cg) and ∓Cg/C.