Figure 3.

(a) Generic elliptical trajectory of a lattice particle in the chiral lattice and decomposition of the displacement field $\tilde{\mathit{u}}$ into a vortex component ${\tilde{\mathit{u}}}_{\text{V}}$ (corresponding to circular motion) and a straight-line component ${\tilde{\mathit{u}}}_{\text{L}}$ (corresponding to a straight-line motion parallel to the major axis of the ellipse); (b) a secondary decomposition of the straight-line field ${\tilde{\mathit{u}}}_{\text{L}}$ into a component ${\tilde{\mathit{u}}}_{\text{T}}$ tangential to $\tilde{\mathit{f}}$ and a component ${\tilde{\mathit{u}}}_{\text{N}}$ normal to $\tilde{\mathit{f}}$.