Extended Data Fig. 9. Tight-binding model on the stacked triangular lattice with 2 × 2 × 2 chiral CDW order.

a, The unit cell of the model consists of 8 lattice sites (black) on two layers, each harbouring a single electronic orbital. The model is defined by the hoppings as indicated, where ω = e^i2π/3 (all complex hoppings are oriented to the right). All dashed lines are associated with real hopping amplitude t_z. We choose numerical values t = 1, t_z = 0.2, Δ = 0.05. b, Fermi surface of the model for chemical potential μ = 2.4 (black lines) and orbital magnetic moment component M_x of the states closest to the Fermi level. We observe that M_x is not only finite, but also large for states on the Fermi surface. c, Band structure along k_z for a particular choice of k_x and k_y, coloured by the orbital magnetic moment component M_x, demonstrating that M_x is an odd function of k_z as required for the measured nonlinear response to be nonvanishing.