RASHBA-DRESSELHAUS SOC

Spin splitting from broken inversion symmetry

α (Rashba strength) 0.5

β (Dresselhaus strength) 0.3

Gate E_z field 1.0

VIEW

OBSERVABLES

k₀ (spin-split shift)—

ΔE (at k_F)—

PSH condition—

Topology—

H_R = α(σ_x k_y - σ_y k_x)
H_D = β(σ_x k_x - σ_y k_y)

Rashba SOC arises from structural inversion asymmetry (e.g., interfaces, gate fields). Dresselhaus from bulk inversion asymmetry (zinc-blende). When α=β, a persistent spin helix emerges — SU(2) symmetry prevents spin relaxation.