Majorana Zero Modes

Phase: Topological (|μ| < 2t)
H = -t Σ(c†ᵢcᵢ₊₁ + h.c.)
− μ Σ c†ᵢcᵢ
+ Δ Σ(cᵢcᵢ₊₁ + h.c.)

Kitaev chain model (2001)
Kitaev chain · Majorana zero modes at wire ends · topological protection