Nodal Superconductor — Zero-Bias Conductance Peak

Parameters

Gap symmetry: Gap amplitude Δ₀ (meV): 20 Temperature T/Tc: 0.1 Tunnel barrier Z: 0.5

Δ(k) = Δ₀·cos(2φ) [d-wave]
Δ(k) = Δ₀·(kx+iky)/kF [p-wave]
ZBCP: surface ABS at E=0
σ(V=0) = 2e²/h per ABS channel

Nodal superconductors support Andreev bound states (ABS) at surfaces where the gap changes sign. These zero-energy states produce a zero-bias conductance peak in tunneling spectroscopy — a topological signature.