Landauer-Büttiker Quantum Transport
Conductance is quantized: G = (2e²/h)·Σ_n T_n. Each transmission channel contributes one conductance quantum G₀ = 2e²/h ≈ 77.5 μS. Vary the barrier potential to see Fabry-Pérot resonances.
G = — G₀ | T_total = — | Resistance R = — kΩ
Each mode n has Fermi energy E_n = n²·E₁. Transmission T_n(E) computed via transfer matrix for rectangular barrier. The conductance staircase is a hallmark of quantum point contacts.